Window cut off by taskbar

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Never had such problems. However, the way I know Windows, I'd try to enable autohide, restart the machine, disable autohide, restart again -- maybe the system set itself into a half-autohide-hybrid-mode.

You could also try un-fixing the taskmar and moving it to the side or top of the screen, then move it back. Or make it larger. Then see if the behaviour changes.

Push Win+P anmd set to extended display, then switch back to computer only.

Windows is weird