On a PC, apps like games and maybe anything else that is using the GPU directly to process the display generally work at fixed resolutions, like 1920x1080 or 216x1440, and when running in full screen ...
TL;DR: The NVIDIA App 11.0.3 update introduces DLSS Override customization for precise tuning, enhancing performance and image quality. It adds Display Scaling and Color Settings, and Optimal Settings ...