When both my monitors are plugged, I have no right click, no taskbar. I can just use pre-configured shortcut to open things, and kRunner when he wants to open (often it doesn't open anymore when I don't type anything in it when it opens)

The workaround I found is to unplug the second monitor. From here the right click work now, the taskbar appear in the screen in a weird place (top) and I can manipulate my computer pretty normally. Problem is that this problem re-occur after a session closing. I want this problem to not reoccur, and I want to be able to use both my monitors like before