In KDE I'm using KWin as windows manager and somewhere in the configuration I defined that KDE should rotate the desktop cube to the left or the right each time I move my mouse pointer to the far left or right of the screen.
If I keep it there for about a second it rotates the desktop cube to the next desktop.
I once activated this but find this very frustrating when I'm trying to reach buttons on the same side. So I want to disable this feature but I can't find it anywhere. I can't remember where that option was that activated this feature.