>>19052241select "Manage 3D settings" then select which says "Image scaling" and set it to ON
hit apply then you can press alt+enter in the game to maximze the window without stretching the shit out of it.
if the image is too blury or too sharp for you you can tweak it with the sharpening slider back in the image scaling option in the nvidia control panel
if you have amd or intel gpu then I have no idea, I am too lazy rn to make full screen patch