Fullscreen Mode rendering some games in 4:3
When selecting Fullscreen Mode with 1600x900, 1920x1080 or 2560x1440 it results in some games being forced to 4:3, it's fine with Windowed Fullscreen/when the resolution is 1366x728 or 1280x720, not sure if this is some OS/Game Mode bug or a game issue.



Solution
No idea how this works but forcing a "Maximum Game Resolution" of 2560x1440 under Display Settings in Game Mode fixes the issue