Have a different fix? Did you manage to get Chaos Theory running in a 4K borderless window? Join the discussion on the Splinter Cell subreddit.
Frequent Alt-Tabbing in fullscreen can disconnect players from multiplayer servers or cause the game to crash.
Find the line labeled ForceWindowedMode and change its value from 0 to 1 . and launch the game. Method 2: Standard Unreal Engine Shortcuts