So... Since the game auto-pauses when I alt+tab out of it (which I hate because I want to do other stuff while I send my chars to backtrack on the maps) I want to run the game in windowed mode (Borderless fullscreen). I tried turning it off in the game's option (the fullscreen checkbox) and every time I save the options, the game stays fullscreen and when I go back in the menu it's still checked again. Even when I change the resolution the screen flickers but it stays 1920x1080 (my resolution) anyway.
I also tried to change the config file manually but when I boot it up it's still checked.