Hey! You can find the game’s settings file located in your user folder:
C:\Users[YourUserName]\AppData\LocalLow\DarkStone Digital\TheSubject
GameSettings.json
you can right click this and open it with notepad and change your resolution by changing the “Resolution index” option.
Unfortunately the export doesn’t convert this index to a simple “number x number” resolution but you can change the number here to get different resolutions. (Mine is 35 for 1920x1080) though it auto populates based off of what resolutions your monitor supports so that number may be different for you.
I’d try a lower number like 20 to 25 and then you should have a better time changing it in game from there. Enjoy!