The Mrs is not so accurate with the mouse and playing kpatience etc… she seems to click the top or bottom edge of the maximized window ( as if to drag a card ) but ends up dragging the window, which moves and re-sizes
I tried it in Gnome and my maximized windows don’t drag.
So is there a solution for kde. I guess it’s a feature. I had a stab around in systemsettings, but couldn’t put my finder on it.