Not really sure how else to phrase it, but when I have FFXIV open on my one screen (borderless windowed) and then open like a steam game on the other (seems to be if said game is set to fullscreen but not completely sure) and then try to go back to FFXIV and click it to do something I click THROUGH FFXIV and my computer switches to whatever is behind the game (like my web browser, or if nothing else is there simply the desktop). Only way I have found to fix this is by using the numpad to go into graphics options, set it to windowed, then hit apply and then i click no (to keep settings) which resets it back to borderless windowed and I can once again click on and play FFXIV. This only seemed to start happening recently (like 2-3 weeks approx).