Windowed scaling issue

I have a weird issue with this game when going into windowed mode. I sometimes like to play in windowed mode when im watching streams but when i put it in windowed mode, the window is super small compared to the set resolution. I have a Samsung Odyssey G9 (5120x1440) and have the game set to 2560x1440 so it should fill the middle of my screen leaving the sides open for other apps, but that is not the case. also when i enlarge the window to fit the screen the text becomes unclear.