Seize the game – carpe ludum! › Forums › Eidolon’s Tavern › Why Kega Fusion [3.64] couldn't be full screen in win10 › Reply To: Why Kega Fusion [3.64] couldn't be full screen in win10
Just for accuracy, this issue is resolved by Disabling Full Screen Optimizations. Setting a compatibility mode for a previous version of Windows is not required.
It probably has something to do with the different way in which Windows 10 handles full screen programs, especially with tablet mode.