Problem with all unreal engine games

There is a problem with all unreal engine games for me, When i try and go into fullscreen from windowed or full screen windowed it always ends up stretched and i cannot click apply or anywhere on the screen.
Games it occurs on:
And any unreal engine games.
This has been happening for the last 5 months and ive tried everything, Ive gone to numerous forums searched up for hours and tweaked around with nvidia settings etc.