I'm testing R3E at another video resolution than my screen but with same aspect ratio. Screen is 1920x1080 and resolution 1280x720. If game is in window mode, display is OK, but in full screen aspect ratio is not good, there are 2 big black bands up and down so game is compressed vertically, but if I take a screenshot with GeForceExperience it looks fine.
Hello Press the win + print buttons then you have a screenshot Gfemacht and in Win10 you can find it here C:\Users\isi\Pictures\Screenshots