You can easily change your screen resolution in Windows 10 at any time via the Display Settings menu.

If you can't change Windows 11 resolution in a VirtualBox VM, ensure you have Guest Addition installed, and other settings ...

ok i've got redhat installed now, i set the resolution as 800x600 during setup just to make sure it all works. well now i'm in kde and when i change the resolution it says i have to restart x-server.