Windows 10: None of my games use Fullscreen Optimizations

For anyone that doesn't know Windows 10 should automatically run fullscreen games in a borderless windowed mode for faster ALT+TABing which they call Fullscreen Optimizations, but for some reason I've noticed that Windows has stopped running any of my games in this mode. I've tried Googling a solution but the only posts I can find are from people that hate this feature and want to disable it, but I would like the convenience of being able to ALT+TAB without my games crashing. Anyone know what the problem might be? Thanks.

:)

 

What exactly is FullScreen Optimization in Creator's Update?

I was not able to find any documentation or description, official or unofficial, on what the "fullscreen optimization" really does?

It turns "true" fullscreen mode into a hybrid Borderless Windowed mode.

With certain games it is recommended to disable fullscreen optimization. Some reports better FPS, reduced input lag, but the results vary per game, probably per configuration.

Sources:

1. Why you should disable Fullscreen Optimizations on Windows 10
   
2. What exactly is FullScreen Optimization in Creator's Update?
   
3. https://www.reddit.com/r/pcgaming/comments/bq7kro/windows_10_forces_games_into_a_faux_fullscreen/
   

 

Can Fullscreen optimization cause input lag?

I've heard some games like Overwatch and CSGO can have some lag input when fullscreen optimization is enabled. Can you tell me what Fullscreen optimization actually does?

 

Windows 10 CU - Fullscreen optimizations


There is a new compatibility option on .exes properties, "Disable Fullscreen Optimizations" , I use Windows Colour Calibration to adjust gamma etc, but when I launch a game, all my settings gets reseted to default, but when I check this box on the game .exe, it launches normally , like on Anniversary Update.

Anyone know what this option does? Or any tutorial to Disable Fullscreen Optimizations globally?