big slur and large beamings

In order to get more experience with MuseScore 4, I'm trying to copy this harp part from Peter Ilyich Tchaikovsky's "The Nutcracker, Op. 71" "Waltzer of the flowers".

As you see, in bars 3 and 4 we have an interesting figure which moves between staves

I have underlined the interesting details in red:

Here is what I see:
a. I see these beamings, grouping all the notes of the same musical length which are also across staffs;
b. I also see this long slur (is this the correct term?) which starts from the first note on che F staff, raising up including higher notes from the staff above then going down again, eventually ending on the last note of the musica phrase.

What I was able to obtain in MuseScore 4 is the following:

I would like to get as close as possible to the original.
How can I obtain a. and b.?

Thank you so much for your support.