[Bug] Alt+Tab reverts to Borderless from Fullscreen

Issue: Setting the Window Mode to Fulllscreen and Confirm and then Save on the initial Alt+Tab to desktop the game minimises as expected.

However subsequent Alt+Tab results in the game window remaining open and play continuing without pause. Check in Settings, the Window Mode has reverted back to Borderless.

I have tried confirming and saving Fullscreen then quitting the game and Restarting the game but it does the same.

This is in the menu and during cutscenes and gameplay.
Spec:
GPU: ​ Asus GeForce GTX 1080 8GB ROG STRIX GAMING -STRIX
Monitor: Asus ROG-SWIFT-PG279Q Monitor

EDIT:

A workaround for now is to Alt+Enter first then Alt+Tab. Then Alt+Enter again to go back to Fullscreen.

This method retains Fullscreen in settings.

Iis tedious to have to do this each time especially when used to Alt+Tab normally otherwise.

Yes thats really annoying.
I play in Fullscreen because it increases my FPS but everytime you TAB out it resets to bordeless.

I have the same problem. I saw a few on steam reporting it too.

The main problem is that returning from borderless to fullscreen messes up my mouse control. In practice this means I can’t Alt-tab at all. I will always need to restart.

Same problem

1080ti, same issue, pain in the butt

It would be nice if this would get fixed on 1.3.0

Same problem, only my monitor has a desktop resolution of 2160p while I’m playing the game in 1080p (for performance reasons), unfortunately for me this means whenever it switches to borderless the game end’s up only covering a 1/4 of my screen, thanks for the workaround.