Maximised window instead goes full-screen on secondary monitor

I drag my application windows around a fair amount to arrange them on my three monitors under Windows 10. If I use the title bar to drag the MuseScore window to the top of the primary screen that has the taskbar on it, the window maximises - all well and good. If I do the same with the aim of maximising on either of my secondary screens, the window instead goes full-screen, and I lose the title bar and window controls to close or minimise it.

I can get it back by pressing F11 to exit full-screen but there doesn't seem to be a way to maximise the window on these secondary screens (pressing the maximise button on a secondary screen does the same as dragging the title bar, and just goes full-screen).

Have I got something configured wrongly, or is this likely to be a bug?

OS: Windows 10 Version 2009 or later, Arch.: x86_64, MuseScore version (64-bit): 4.2.0-233521124, revision: eb8d33c