[MU4 Issue] Items in "Properties" sidebar jump all over the place during use

Describe the bug
If you make a change to a property in the "properties" sidebar, you expect the property items to stay in position. However, if you click on the "More" option, then click on any property, the items suddenly shift position, leaving the user bewildered!

P.S. I am using a 15 inch screen laptop.

To Reproduce

1. Open the attached score (unzip first).
   auber - fd_on_yonder_rock_(hayden).mscz.zip

2. Click on, say, an item of text in the "Title" frame. Click on various items visible in the "Properties" sidebar. Note that, as expected, the items remain in position.

3. Now expand the "More" button in the Properties sidebar. Again, try changing any property.

RESULT: The items suddenly, and for no apparent reason, jump to a new position.
macOS and Linux

https://user-images.githubusercontent.com/101250347/163194736-20713e44-7f6b-48d3-afd5-2d4c2b07d8dc.mov

Win11

https://user-images.githubusercontent.com/101250347/163371059-134f555f-6d57-40af-864d-5f97a42629a1.MP4

Expected behavior (edited)

When the user clicks on "More", this button should remain stationary and the "submenu" (if that's the right word) should unfold below it, causing scroll bars to appear (or extend). The user then scolls down to reveal the submenu properties. This is the current behaviour under MS3.

Platform information
OS: macOS, Win11, Linux