Changing audio output lowers toolbars until MS is rebooted
1) Open preferences>I/O
2) Select a different output device in the menu (I swapped from default to a bluetooth headset)
3) Press OK
Upon returning to the main work interface, you'll find all the toolbars at the top of the screen have fallen by around 3 cm. Trying to drag them back up won't work. Closing Musescore and rebooting it fixes the issue, but it also undoes the audio device change.