My only pain with KDE is trying to resize windows. I have a 1 pixel line a certain distance away from the outside of the window. I'm using an oldish version from kubuntu 22.04 though.
I might be able to help you with that. Whilst holding Meta (Windows key), try left and right-click-dragging on a window. Left-click-drag moves the window, right-click-drag resizes it. Great feature imo, for me, this flow solves any resizing issues.