MuseScore 4 screen size not adjustable and odd screen 'creeping'

Hi,
Problem one is that the app loads up full screen and cannot be adjusted. There are no minimise, close or 'restore down' buttons in the top right that most apps windows include, and as the app loads full screen there is no way to adjust it.
Problem two is that the screen will often duplicate over itself as if it is opening multiple versions of the same screen. Imagine the 90s when a virus would create multiple popup windows in quick succession and you get the rough idea. It's not terminal and I can get past it by clicking on the screen, but it can be really offputting.

Windows 10 Home Build 19045
i9 109000
32Gb
TUF GAMING z490 Plus (using onboard graphics)

Cheers,
Jamie