Game alt+enter problem

Hello!
I have a problem with resolution after change into fullscreen mode.

When I click alt+enter (change to fullscreen mode), the resolution is set to 1152x864 (4:3) (this is problem).

I have full hd monitor. If I want to play at fullscreen mode in 1920x1080, I have to go to settings and handly change it on 1920x1080. This is very annoying beacouse the game goes into windowed mode every time I click outside the game area.
My specification: 1920x1080 monitor (Main monitor), 1280x1024 monitor (twice monitor), Nvidia geforce 1660ti,

 

I think you might have to restart the game to change the resolution, it may be due to the dual screen setup but I'm not completely sure. And the game going to windowed mode, umm yeah that happens when you click outside of the game when in fullscreen. Try to put the game into borderless windowed mode, not completely fullscreen but doesn't show borders. And if you put it to the max res of the monitor, as you said, 1080p, you should be able to use the other screen while the game is still open and looks like fullscreen without the window.. try it maybe?