Since getting Ubuntu 20.04, logging in with Gnome was rather limiting. I couldn’t drag any icons around on the desktop. Switching to MATE solved this. In terms of the appearance that makes the windows look different, I’m using the “New Wave” theme as I wasn’t keen on MATE’s default theme. I don’t think this will be related as I’ve used 20.04 MATE and this New Wave theme ever since I bought this PC and it was stable with this setup for the first month or so.