Musescore 4 screen cannot be minimised.

Musescore 4 cannot be minimised on my computer running Windows 10. I want to copy sections from a part to a new score and cannot find a way to do this in Musescore 4. It was easy on Musescore 3.
The opening screen covers the entire area of the screen and the Taskbar at the bottom of the screen is covered. Is it just my computer setup or is there a problem with Musescore 4?