problem that anyone who owns the Dark Souls on pc can fix

so, was running Dark Souls in 2880x1560 ogssaa, when I got some minor slowdowns. I set the game to 1920x1080 and didnt like the reduced graphics quality so I switched it back to 2880x1560. However, it remained a black screen until switching back to 1920x1080. I thought it was maybe just taking too long to load, so I pressed 'accept' while it was still on a black screen. changing the resolution in DSFix.ini didnt help.

I dont remember how the menus laid out, so could someone tell me exactly what buttons I have to press to get to resolution under PC settings?

your best option is to just re-install the game. thats done in a few minutes, and you can choose to not delete your save data, and then it'll be back to its default settings