In PC version of Dark Souls 3 running on Windows 10 the game switches on default resolution in Borderless window mode, but uses the resolution set in fullscreen mode. Replacing textures and changing FPS options doesn’t solve the problem, but there is one option that can be available: it is necessary to run DARKSOULS.exe in Windows 7 compatibility mode.
If this option doesn’t work out we also recommend to set following parameters as they are mentioned below:
- borderlessFullscreen 1
- forceWindowed 1 (at the very bottom of the ini)
- forceFullscreen 0
- ingame: Windowed (you could also try Fullscreen setting ingame, just test it out)
Also, you can manually edit file named DarkSouls.ini that is located on the following path [C:\Users\YOURNAME\AppData\Local\NBGI\DarkSouls] in order to use your own specific resolution in case of using windowed mode (don’t forget to make the file as read-only).