If you are trying to change settings in NVIDIA Control Panel but can't save the settings, follow this post and apply these fixes to resolve the issue.

NVIDIA Control Panel Custom Resolution is greyed out or not showing up 1] Update your NVIDIA display driver If you experience the NVIDIA custom resolution not supported by your display issue, the ...

Nvidia Control Panel is a companion app for Nvidia graphics cards, used to manage settings and features specific to your GPU, which can help optimize its relationship with your display and your ...