High contrast mode leaves lasting damage?

Someone from my class has activated the "High Contrast" mode for fun on my Windows 10 laptop. When I switched it off, not all traces were gone. The taskbar was suddenly white, OneNote and browser are black, etc. I have not found a way to fix it. Has anyone ever experienced that?

Have to look, maybe the colors are inverted. Or whatever that means

Means: Black => White

all colors are then turned over.

If that does not help, I have no idea

If necessary, just do System Restore. Back to a day, if available.