No "Split Staff" Option (second attempt)

I posted this like 3 months ago or so, forgive me if the feature has been added finally, but it probably hasnt, so whatever.

Unlike MuseScore 4, at least in MS 3 you have the option of having 3 staves.
How th am i suppose to put in 3 staves for piano? The button to do so is completely gone in ms 4.

I either need a workaround, or even better they need to add it back in ms 4