Look for C:/Users/(your username)/AppData/Roaming/Void_War/profile.sav on your Windows OS drive and crack it open with your text editor of choice. Everything in here is surprisingly very easy to read and fumble with.

So you can search for 'currScreenSize' and then adjust the resolution numbers in accordance to what you need. The other relevant settings are also close by, such as disabling the Filtering for Integer-Scaled resolutions via 'textureFiltering', as well as re-enabling Borderless via 'toggleBorderless'.

If you want to be really silly, you can also experiment with looking through everything else and doing things like forcefully unlocking all the Torment Levels and the like, but I'll leave that to your discretion.

Have a nice day.