Created attachment 103268 [details] Overlapped, gapped and normal positions I accidently am able to position monitors incorrectly. You are able to overlap displays on each other and also you can place them with a gap, so you could loose your mouse cursor. See attached screenshot for understanding what I mean. It often happens after changing screen resolution. Expected behavior: you are only able to place one monitor around other. Or at least, after enabling "expert mode" checkbox for doing this. I think it is easy to fix, because there is already a function that sticks monitor to the border of other while dragging it. We just need to disable ability of "free flying" of monitor. If "free fly" is necessary for example for dragging fifth monitor to a center of four monitors placed like a "+" symbol, then at least we should fix overlapping when user drops monitor in wrong place. In windows os and in cinnamon it behaves as I describe.
We don't want an "expert mode" in general, since that gives users zero indication if they should use it or not, users often can't judge whether they're an expert or not, and in which field. If you're saying that monitors should always share one edge with each other, I disagree, while positioning monitors, especially if you have more than two, this is essential.
This issue has actually been resolved in 5.27. See https://bugs.kde.org/show_bug.cgi?id=464760#c1