I'm glad you tried because you have succeeded! I used OneTweak before I ran into this issue but people on the discussion page for that mod were saying that the built in borderless window feature in ENBLocal.ini does the same thing but with less bugs so I switched to that. I switched back to OneTweak based on your suggestion and it works great! It refreshes when not selected. I believe I might be the first person to succeed in true fullscreen splitscreen Skyrim co-op or, if not, then the first to post about it. I have lots of optimization to do, mainly decreasing the graphics as little as I possibly can to make the game stable for both players. I'll make a tutorial on how to achieve this when I'm finished for the less technical people out there or maybe try to make this a streamlined process or mod. Thanks! EDIT: Kudos given kind sir.