Upon opening the game, it will only open in a VERY small window. I tried alt+enter and all it does is use the exact same window just now blown up to my screen size. I've attached a photo to demonstrate the issue. Nothing I have found seems to be able to make it open either fullscreen or windowed larger. I tried it before and after updating my Nvidia card.
Here's a link to an image of my desktop. https://imgur.com/a/etYlxei
DxDiag.txt