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 ...
Gaming at native resolution makes you a Luddite today ...
Housemarque's action game Saros gets enhanced PSSR upscaling, higher render resolution and advanced DualSense features on PS5 ...