Question Nvidia control panel - scaling full screen can't change to scaling GPU only display, why?

[syykii]

As the title say's when i go to nvidia control panel, adjust desktop size and position and i select scaling and full-screen then perform scaling there's only one option display but it has to be set on GPU how do i enable gpu? monitor benq xl2586x+ tried different monitor same thing, gpu rtx 5090 astral oc. Btw image scaling is off, and 3d settings are set on performance.