|
New computer, so double check your display settings for the PC. Screenshot looks like something x 1080 so ensure it is not in System -> Display. Also check custom scaling in at that same location. Should be 100%. If it is set for something much higher it will have the same effect on the game as loweing your resolution.
If all else fails, just to ensure it is not the game... use the User Defined Window size per the image below. This is what I use on my 4K monitor when it is not maximized. It will fill up "most" of the screen when the display is set to 3840x2160 and Scale is 100%. If it looks funky when you do this then it is seeing your PC resolution as something very different than 4k.
__________________
|