MuseScore 4.3 is now available!
We are delighted to announce the release of MuseScore Studio 4.3. This latest release in the MuseScore 4 series is the first to use the new MuseScore Studio branding that we announced earlier this year. This version contains numerous fixes and improvements, including a new sound flags feature that provides advanced control over score playback with Muse Sounds.
MuseScore Studio remains free and open source under GPL version 3.
Watch the release video
Having trouble viewing this video? Click here to watch it on YouTube.
How to get MuseScore Studio 4.3 and Muse Sounds
I already have MuseScore 4
If you already have MuseScore 4 or later then you’ll see a message about the 4.3 update next time you launch the app. If you don’t see the message, go to Help > Check for update, or download the app manually instead.
To get the latest Muse Sounds, you’ll need to use the Muse Hub utility (Windows and Mac) or Muse Sounds Manager (Linux). You can download this from musehub.com if you don’t have it already. Muse Hub can also be used to update or install MuseScore Studio.
I’m new to MuseScore 4
Head over to the Download page to see the available options.
Windows and macOS: The main download option gives you the Muse Hub utility, which you can use to install MuseScore Studio and Muse Sounds. There's also the option to download MuseScore Studio without Muse Hub if you prefer.
Linux: The main download option will just give you MuseScore Studio; you’ll also need to download and install Muse Sounds Manager if you want to get the new sounds.
You can find additional builds on our GitHub Releases page, including a portable Windows EXE, as well as AppImages for 32- and 64-bit ARM Linux. Please note that Muse Sounds Manager is not currently available for ARM Linux.
New features in 4.3
Sound flags
Sound flags appear as a 'speaker' icon to the left of Stave Text elements. Clicking this icon reveals a list of playback options that can be used to control an instrument's sound from that point onwards in the score.
At present, the playback aspect of sound flags only works with Muse Sounds, not SoundFont or VST. However, when you share a score that contains sound flags, stave text entered via the sound flags popup will still be visible to other users even if they don't have Muse Sounds installed.
Engraving
New options in Format > Style to:
- Hide clef and key signature after the first system
- Show ties and repeat fret numbers for tied notes in tablature
Plus Various other improvements.
Version history
For those of you that choose to save scores to the cloud or publish to MuseScore.com, you'll find that MuseScore.com now offers the ability to back up and restore from previous versions of your scores.
MuseScore Studio branding
The new name helps to distinguish the desktop program from other MuseScore products, such as the MuseScore.com and mobile apps.
While the name has changed to "MuseScore Studio", for compatibility reasons many files and folders relating to the desktop program are still called "MuseScore 4".
Privacy policy
We had to update the privacy policy to reflect the name change to MuseScore Studio, so we also took this opportunity to clarify some of the wording around data collected during error reporting (e.g. if MuseScore crashes). The actual data being collected and stored on our servers has not changed; only the wording of the privacy policy has changed. Data is anonymized as soon as it is collected. We do not store any personal information.
Other fixes & improvements
See completed tasks in the 4.3 project for the full list of changes.
评论
Where is the download? When I open 4.2.1 and "Check for Latest version" it tells me I'm up to date. When I go to the download page, where I read "The latest stable version is 4.3.0" It still downloads 4.2.1.
回复meferris7的Where is the download? When…
We haven't yet pushed the in-app updater. We will do this in the coming hours (tomorrow at the latest).
Which operating system are you using? Perhaps try clearing your browser cache and reloading the web page?
回复bradleykunda的We haven't yet pushed the in…
I'm on a Mac. Will give that a try. Worst case, I guess the in app updater will know about it soon. Thanks!
回复meferris7的Where is the download? When…
Check in MuseHub
回复Jojo-Schmitz的Check in MuseHub
Hub will be updated very soon (hold tight!).
EDIT: 4.3 is now live on Muse Hub!
回复bradleykunda的Hub will be updated very…
So I had high hopes for some playback enhancements, and the staff text feature is great. One thing I've been wanting is muted trumpet. That is, with a straight mute, not a Harmon mute. When you apply the mute symbol (+) to trumpets, it still applies a Harmon mute. This sound is very different from a straight mute. Is there any plan to support a straight mute?
回复meferris7的So I had high hopes for some…
I assume, with sound flags, this would be much easier. idk
回复meferris7的So I had high hopes for some…
Yeah, so the options you see in the "sound flag" popups are all taken from the sound libraries themselves. As we continue to expand the libraries, more options will become available (without us needing to even update MuseScore Studio). I can confirm that different brass mutes are being worked on as we speak :-)
回复bradleykunda的Yeah, so the options you see…
Thank you, this enhancement would be HUGE!
回复bradleykunda的Yeah, so the options you see…
Any plans for fixes on the clarinet and oboe? They suffer a lot from crackles and pops that sound like what happens if you don't cut a waveform at the zero crossing.
If this problem were eliminated, I'd pretty much use musesounds exclusively.
回复OneDeadLombax的Any plans for fixes on the…
Preferences -> I/O -> make the buffer size larger. In my experience this helps with the crackles and pops in older computers, tho it may cause some other issues with audio while you are editing notes.
It’s probably a problem with your computer handling muse sounds—they are pretty hard to play back live. If the problem persists, make a new post.
回复bradleykunda的Yeah, so the options you see…
Any news on when the different brass mute features may be released?
回复Jojo-Schmitz的Check in MuseHub
Does MuseHub require Root Directory Access?
If so, why?
Please be specific. Technical deep dive is fine.
Yay!!
This video makes the update look a whole lot better lol
(So, when are the per-voice dynamics coming out?)
回复 Asher S. 的Yay!! This video makes the…
Soooooon :-)
(Currently targeting 4.4).
回复bradleykunda的Soooooon :-) (Currently…
I’lll taaaake your wooord for itt!
回复bradleykunda的Soooooon :-) (Currently…
Is there any catch ya’ll are struggling with? Ambiguity with the controls?
Did you consider putting the muse choir additions to the update video and post?
Version history is a great add on! Will it be available offline as well?
回复.ash86的Version history is a great…
It is a musescore.com feature, so no, only online
But for 3.x scores too, and even back to the dawn of day...
回复Jojo-Schmitz的It is a musescore.com…
Really! Like as in, before the actual 1.0 release? Beta and Alpha?
Please see https://musescore.org/en/node/363755 for some bugs.
Will there be any work on Musescore Drumline in future versions? I've had success working with Muse Sounds but sometimes it is just not suitable for writing for marching percussion. Love the changes in this version, though!
回复GabeH_的Will there be any work on…
Musescore 4.4 will have a big percussion update, and I’ve heard that muse marching percussion will replace musescore drumline.
回复 Asher S. 的Musescore 4.4 will have a…
Oooh do you know any details (that you can share!) about the percussion features planned for Musescore 4.4?
回复vallieplushie的Oooh do you know any details…
No but I hope it comes close to Dorico :P
My best guess would be additional samples, improved engraving, and more things like the guitar update had.
回复 Asher S. 的No but I hope it comes close…
Dorico really hit the jackpot with the whole player model when it comes to percussion...
I really hope it's engraving changes (cross-staff beaming between tuned and untuned would be INCREDIBLE) and an update to the Edit drumset dialog, which is so hard to use at the moment. Either way, I'm so hyped!
I'm not so fussed about playback personally, but that would still be cool :)
回复vallieplushie的Dorico really hit the…
I’ve listened to some old drumline scores and they sound great. Can’t wait to use that with muse sounds and musescore 4
Glad to see someone who likes Dorico too 😉
Definitely struggling over here with whether I want to subscribe to Dorico, with its features being made much more up-to-date by a full-time (afaik) staff. It was launched much later than MuseScore, and it is already on 5.1.32 over here!
But musescore is free and has a music sharing platform; and it’s really tedious converting files from one to the other.
回复 Asher S. 的I’ve listened to some old…
Yeah, I'm not sure whether I should pay for Dorico or not. I think if Musescore implements a condensing feature similar to Dorico and improves the workflow for part preparation, I'll definitely stick with Musescore. I use notation software mostly for engraving so playback isn't hugely important to me, which is why I'm torn!
回复vallieplushie的Yeah, I'm not sure whether I…
"I think if Musescore implements a condensing feature similar to Dorico and improves the workflow for part preparation, I'll definitely stick with Musescore."
"Condensing feature, Part préparation"? 🙄
Could you please elaborate on exactly what features you are referring to in MuseScore (I don't know of any, at least under that name) that would be inferior to the equivalent Dorico features?
回复cadiz1的Condensing feature, Part…
Sure! Condensing is when you have parts for separate instruments displayed one staff, which is often the case in orchestral music (2 flutes on one staff etc.). In Dorico this is handled super easily; you write the flute parts separately and then the parts are merged onto one staff in the score and crucially the staff label updates to match, a 2 text is added, the two voices share stems when in rhythmic unison but not when not in unison, etc. The fact it does this automatically without actually changing the content of the music is so nice, because then in the part view the music for the individual instrument is completely intact. In musescore it's possible to do something sort of like this by writing both parts in different voices, but the staff labels don't change when only one staff is visible, you need to change visibility of beams and such to make unison passages, etc. So it's possible, and I've done it before, but it takes a lot more work. Musescore is generally on par with Dorico and I'm a huge fan of musescore! But it's these kind of quality of life features that make a world of difference when I have an orchestral score and need to prepare good looking individual parts :)
Sound flags are not working for me on Windows 11. When I drag "staff text" to the score it has a red circle with a line through it and it doesn't drop anywhere. Does something else have to be enabled?
回复bill0287的Sound flags are not working…
1) It has to be on a staff with Muse Sounds.
2) I usually select what I’m applying the text to then click “staff text” in the palettes.
Never heard of or seen this red circle/line thing.
回复 Asher S. 的1) It has to be on a staff…
Sound flags not working for me either. They are grey and disappear when i click on them. Yes im using musesounds. also win 11.
回复.ash86的Sound flags not working for…
Sound flags are grey for me too. I just click on the speaker icon and it works. What are you doing? Please explain your steps.
回复 Asher S. 的Sound flags are grey for me…
i posted a video on the support channel in discord showing my steps. here it is https://discord.com/channels/818804595450445834/818804809784229898/1237…
回复.ash86的Sound flags not working for…
I'm in the same situation
回复 Asher S. 的1) It has to be on a staff…
okay, it doesn't work if I "drag" the staff text to the score, but it does work if I select a measure and click on staff text. Dragging is what is creating the circle, so I guess it's not supported.
Edit: okay, it does work, but you have to be more specific about placement.
回复bill0287的okay, it doesn't work if I …
Last time I checked that worked, I’d recommend raising a bug report.
回复 Asher S. 的Last time I checked that…
So, help / Revert to factory settings, finally fixed the issue.
回复.ash86的So, help / Revert to factory…
Oh cool
Now I can choose between the 3 Shakers & all the good stuff.
回复s1114182721的Now I can choose between the…
Oh cool
I didn’t get to checking the percussion but there were some pretty major issues with the samples, see the link I posted above.
What are these “upcoming sound libraries” in question?
Guys need help! MS is crashing by the opening. This morning was everything fine. But then I couldn't open the previous version, installed the new one, and it did't fixed the problem. ((
回复MaxTheSaxMan的Guys need help! this morning…
Try opening Muse Hub > Settings > Check for updates. This should silently download a new version of the Muse Sampler library used by Muse Sounds. Wait a few seconds then try opening MuseScore Studio again.
Let us know if it still crashes for you after you've done this.
回复shoogle的Try opening Muse Hub, go to…
Nothing is working. The problem is much more deeper.
https://musescore.org/en/node/358850#comment-1222375
here is a solution how to get Musescore studio running, but it this case muse sounds doesn't appear in a menu, even it installed. I've uninstalled muse hub completely, (with deleting files from the library) Installed the strings from new, and the error came back again.
https://musescore.org/en/node/363760 - here is another issue. It might be Big sur issue.
How did you do the thing near the end of the video with the hairpin subdivisions over longer note durations? I can't seem to figure it out.
回复Grimes Music的How did you do the thing…
They were talking about 4.4
What sounds are sound flags available for? I don't seem to have any for MuseStrings - do I need to update that separately? (but I don't see an option to do so...)
回复Dylan Nicholson1的What sounds are sound flags…
You have to update all muse sounds in the muse hub, and muse sampler has to be updated (diagnostics -> check muse sampler and see if it’s on 0.6)
回复 Asher S. 的You have to update all muse…
Wow, to do that I literally had to delete C:\Windows\System32\MuseSamplerCoreLib.dll and fully restart Muse Hub and MuseScore - but yes, that did the trick, thanks. Not quite sure how we're supposed to know that's required...
回复Dylan Nicholson1的Wow, to do that I literally…
I thought it said somewhere. I guess not.
回复Dylan Nicholson1的Wow, to do that I literally…
I've done that too, now. And indeed this way the MuseSampler got updated from 0.4 to .61. I've deleted and installed percussion and brass again. But still I can't use the new staff text features. The reaction is, that for trombone there is no staff text action available. So may it be. So I tried for vibraphone as demonstrated in the 4.3 video. But even for vibraphone there is no staff text action available for me.
Is there any additional voodoo action that I can try?
OS: Windows 10 Version 2009 or later, Arch.: x86_64, MuseScore Studio version (64-bit): 4.3.0-241231433, revision: 5f36e74
回复SlyDr的I've done that too, now. And…
Muse hub -> ⚙️-> check for updates. This will quietly update the muse sampler.
回复 Asher S. 的Muse hub -> ⚙️-> check for…
I'm constantly getting an unable to uninstall error message when trying to update.
But in the end the staff text feature worked anyway.
回复 Asher S. 的You have to update all muse…
Hello,
I just finished updating MuseScore 4.3, but only some of the sound flags seemed to be working. I updated all the MuseSounds from MuseHub, but after checking the diagnostics, the muse sampler was still 5.3. How do I recover/install the new version of muse sampler? Thank you in advance.
EDIT: I have now deleted and reinstalled a MuseSounds Pack, which updated the muse sampler! For anyone interested, go to MuseHub, hold the alt key to bring up the delete buttons, then delete and reinstall a sound pack.
Hi! The app keeps crashing when trying to open since the studio update released yesterday. I don't know why it happens, it has never been any problem launching the program and I really need some help. I'm using Musescore all the time and I really need it to work. //Jakob
Instruments missing? how to fix this...
回复Ayden_Kael的Instruments missing? how to…
Fix the “family” drop-down :P
回复 Asher S. 的Fix the “family” drop-down :P
No they are literally all gone... :-O
回复Ayden_Kael的No they are literally all…
I feel like this update has the most mixed results ever, can’t wait for .3.1 haha
As I updated MuseScore 4.3, I went to see about the brass. When brass goes from mf to f, it gives a different tone, a much more "brassy" loud tone. Sometimes this tone is perfect for certain pieces, but for those that it isn't, it just limits me to mf so I do not get that sound.
I was hoping this would have been a thing for brass but I realized there are no options for it when I go to staff text. So my question is, which instruments are involved with that updated besides the ones shown (string, percussion). Is there a substitute for brass, or is mf dynamic the only way to go?
回复Dan Eisert的As I updated MuseScore 4.3,…
Is muse sampler updated?
回复Dan Eisert的As I updated MuseScore 4.3,…
Never mind
回复 Asher S. 的Never mind
yeah i downloaded. does it show for you? should I close and repoen
回复Dan Eisert的yeah i downloaded. does it…
No I thought trombone had some but I was wrong haha
回复Dan Eisert的As I updated MuseScore 4.3,…
i have the same issue. Muse sounds are great when they play properly, unfortunately thats not aways the case. This one plays better in Staffpad.
Thank you for another great release to everyone involved in any way! <3
I would also like to say thank you to all of you who are active in the announcements forum to regularly share insights about upcoming releases for those who don't follow along with all the activity on github.
I understand that musescore.com, iPad and android app as well as muse sounds are not developed as open source (and probably by other people) but sometimes I wish there would be this level of transparency as well. (if there should be a similar forum that I am not aware of for these products, I'd be thankful for the respective links.)
回复takatuka的Thank you for another great…
https://musescore.com/groups/improving-musescore-com
https://musescore.com/groups/musescore-on-android/
https://musescore.com/groups/musescore-on-ios/
回复 Asher S. 的https://musescore.com/groups…
Thank you! :)
I just did the update to 4.3 and I can't get the sound flags to work. The speaker icon shows up but disappears when I click on it. I tried to right click and left click,,, maybe I'm doing something wrong, IDK.
MuseHub 1.0.2.800
MuseScore Studio 4.3
Windows 11.
回复Southafricancomposer的I just did the update to 4.3…
I just have to zoom into the speaker icon and then it works.
So now I'm going to play around with that... Thanks.
回复Southafricancomposer的I just did the update to 4.3…
I have the same issue. What worked for me when I see the grey speak icon is to click and move the page just a little and then click again on the speaker icon. It then becomes active for me (using the scroll wheel also kicks it into gear).
(Also try using ALT-left arrow)
回复dd2023的I have the same issue. What…
I had the same problem and it got fixed after i reverted to factory settings from the help menu.
回复.ash86的I had the same problem and…
👍
回复dd2023的I have the same issue. What…
Okay, that may work... Thanks.
Great update.
Since nobody sees my post:
Are the samples accessible thru the sound flags supposed to be devoid of articulation? I apply accent, staccato, and marcato to a cello playing sul ponticello, and it continues to play them legato.
Shouldn't the title of this article be "MuseScore Studio 4.3 is now available!" instead of "MuseScore 4.3. is now available!" :)
回复hstanekovic的Shouldn't the title of this…
Yes!
fantastic upgrade, amazing!
However, the solo violin sounds still have the same annoying quality. Basically they sound like someone is playing the violin with one finger on one string, so that every note must have a slide or glissando in front of it. Up gliss or down gliss, doesn't matter, it is an unneeded "artifact". Just a clear definition between one note and the next would be great. Sorry to complain, it kind of makes that particular sound unusable.
回复sevcikshifter的fantastic upgrade, amazing!…
Change to violin two solo!
for muse guitars volume 1, cross noteheads created dead notes in the playback, but that doesn't happen anymore and i think it's worse off.
回复34futurama的for muse guitars volume 1,…
"cross noteheads created dead notes in the playback, but that doesn't happen anymore and i think it's worse off."
Sure? Works as expected here with 4.3, see: dead notes.mscz
回复cadiz1的"cross noteheads created…
It needs updates so that it'll happen again.
回复s1114182721的It needs updates so that it…
Don't understand. Which update? Version 4.3 and Muse Sampler 0.6.1 here (check in menu Diagnosic / Muse Sampler etc.)
回复cadiz1的.
The cross Noteheads for Guitar work on my end. I just had to delete the whole musescore thing, then re-install it which fixed it.
Musesounds strings could use a new update, the Solo Contrabass sound
回复s1114182721的Musesounds strings could use…
Well with this update came more choir sounds so we can at least hope that other packs will get new instruments as well. :-)
Grace notes finally work!
回复FBXOPWKDOIR2的Grace notes finally work!
Yay
Will MuseScore 3 Evolution still be able to open MS 4.3 scores?
Need that as MS4 can not handle midi export with parameters made in the mixer.
Maybe this is a question for Jo-Jo Schmitz?
回复BrunoCatt的Will MuseScore 3 evolution…
I've opened a MuseScore Studio 4.3 score in MuseScore Evolution 3.7.
No issues with that ... as far as I know.
回复BrunoCatt的Will MuseScore 3 evolution…
Yes, it is. And 4.4 scores too
回复Jojo-Schmitz的Yes, it is. And 4.4 scores…
Lol
回复 Asher S. 的Lol
Lol... Because ? What is specifically funny in there ?
回复frfancha的Lol... Because ? What is…
Well musescore 4.4 isn’t even out yet. And I thought it would be a bit before it supported .3 files. Joachim really knows what’s coming next, doesn’t he?
回复 Asher S. 的Well musescore 4.4 isn’t…
I know the nightly builds...
回复Jojo-Schmitz的I know the nightly builds...
:D
回复Jojo-Schmitz的I know the nightly builds...
Still impressive!!! *thumbs up*
回复BrunoCatt的Will MuseScore 3 evolution…
Thanks for help! Nice to hear the compatibility will be there also in 4.4 as the midi export seems the be a low priority...
I wonder if there will be an actual orchestral gong
回复hnstudyonline的I wonder if there will be an…
[Comment Deleted By Author]
Great update, and I would like to ask if you can update a feature to add a number tab? We have a lot of users using this type of tab in China
回复hanniber123的Great update, and I would…
I’d suggest you just use sheet music on the score then use a word-processing program to write the tabs. If I understand what you mean.
回复hanniber123的Great update, and I would…
I guess you want Jianpu notation?
回复Jojo-Schmitz的I guess you want Jianpu…
If you want Jianpu notation there's a Jianpu notation plugin for MuseScore that might help:
https://musescore.org/en/project/jianpu-numbered-notation-0
回复scorster的If so, there's a plugin…
This is exactly what I want! Thank you
Thanks for the update! I'm really excited to try all the new sounds.
Unfortunately, the vowel choices for the choir aren't showing up for me. (I've attached a picture for reference.) The piece I'm working on requires humming, so I was relying on this feature.
I reinstalled everything to be up to date, but I'm still having this issue. Any suggestions?
回复Kid Cass的Thanks for the update! I'm…
I'm also trying to get this to work. No luck so far...
回复meferris7的I'm also trying to get this…
It only works for the “women” and “men” sounds. Although afaik the “women” sound doesn’t work anyway.
回复 Asher S. 的It only works for the “women…
Wait, there are "women" and "men" sounds? Are they in the mixer under Muse Sounds or is it just the staff name that matters?
回复Kid Cass的Wait, there are "women" and …
both
回复Jojo-Schmitz的both
Weird… I'm not seeing them. My app and sampler are up to date and I'm working on windows 11, so I don't know what the root of the problem is. Is anyone else running into this issue?
回复Kid Cass的Weird… I'm not seeing them…
No, your sampler apparently is not up-to-date
Check Diagnose > Muse Sampler
回复Jojo-Schmitz的No, your sampler apparently…
I'm on 0.6.1. Is there a newer one?
回复Kid Cass的I'm on 0.6.1. Is there a…
No.
And in the Mixer I see this:
In Muse Hub this:
回复Kid Cass的Weird… I'm not seeing them…
Perhaps muse choir isn’t updated.
回复 Asher S. 的Perhaps muse choir isn’t…
Hi all,
Just confirming that I've spoken with the Muse Sounds dev team and they are working on an update that should hopefully resolve the issue of different phonemes not appearing on individual voice types.
回复bradleykunda的Hi all, Just confirming that…
Thank you so much! I'll be sure to stay tuned. (Pun only kind of intended.)
Thanks again to everyone who worked on this update and everyone in the discussion helping guide other users through troubleshooting! And sorry for all the questions…
It seems that there's an issue with both the "Women" and "Full choir" sounds. The "Women" sound can't play above a G4 (it seems like it should be a combination of the "Soprano" and "Alto" sounds, which both reach above that note). The "Full choir" sound is also not playing its upper range.
I've also attached an image of what my interface looks like, where there's a whole separate drop-down (drop-sideways, I guess) for the expanded brass and choir sounds. Don't know if it looks like this for anyone else…
Are these both glitches that everyone is running into, or is it just me?
回复Kid Cass的Thanks again to everyone who…
I have this problem too.
回复Kid Cass的Thanks again to everyone who…
@Kid Cass Are you planning on composing new songs with the new choir features?
回复beniegenie的Are you planning on…
Hopefully!
回复Kid Cass的Thanks again to everyone who…
The first problem - where some sounds don't include notes above G4 - is known and reported on GitHub already as https://github.com/musescore/MuseScore/issues/22572. Apparently it doesn't affect all systems, and it does not appear there is an understanding yet of why someone people experience this and others don't.
The second problem - where the menu is labeled incorrectly - is just a sign that you don't have the most recent versions of those sounds. Fire up Muse Hub and check for updates. Remove and reinstall those sounds if need be.
I'm having a problem where I can't add and or see the option for the stave text, so I cants chamge the siund of the instrument. Does anyone have any tips on how to solve this?
回复chaseS11的I'm having a problem where I…
The sound flags are only available after updating both MuseScore Studio and Muse Sounds, and it will only appear for instruments that are using Muse Sounds.
if you have further difficulty, please ask for help in the Support forum, and attach your score there, and give precise steps to reproduce the problem. Then we can understand and assist better.
Thanks for the upgrades. Since updating my program, I am no longer able to stretch/shrink measures using the shortcut keys. Have they been disabled, or is there a fix to get them working?
回复FBWhitney的Thanks for the upgrades. …
Do you mean the "{" and "}" keys to activate the "stretch" commands that are designed for certainly unusual spacing effects? If they are located above the "[" and "]" keys, they should work as usual, but maybe your definitions got messed up somehow. Or if your keybaord layout places them differently, that might be an issue. Either way, you can go to Edit / Preferences / Shortcuts to redefine those commands.
Do note that these commands would not be something one would need to use in normal use very often, unless the goal is to create inconsistent spacing. In previous version the default spacing was bad enough that these commands might be needed to fix it, but that should almost never be needed as of MuseScore 4. It was also formerly usefuly to squeeze more measures onto a system in cases where simply reducing the default note spacing or staff size isn't the better approach. But now there is a better way to do that also - the "keep measure together" element on the layout palette.
If you have further questions, please start a new thread on the Support forum and give more details, so we can understand and assist better, while keeping this thread focused on the update itself.