How to turn on 1440p 120 Hz on XBOX Series S?

What resolution are you trying to run at

If 4k 120 Hz then no it won't run at thaf

The max for series s is 1440p at 120hz

It will play at 4k bur only some games and with issues

The series s is meant for 1080p 120 max

With suggested 90hz

The xbox series x and ps5 and switch pro are the only 4k consoles

One x does 4k at 30hz and ps4 pro upscales

Because your monitor doesn't support it properly. It's overclocked. VESA standards are for everyone to adhere to so consumer electronics work together reliably

Monitors are intended for use with a PC, where these standards are different. I always recommend just buying a TV unless you're doing professional graphics or video work where color accuracy is important.

This monitor retails for $179, it's not meant for performance. The product page specifically says it's intended only for computer use. Devices that do 120hz natively, both in electronics and the actual panel, start closer to $500

It's Samsung Odyssey G3 F24G3T

I've tried it and I'm theoritically able to turn on1080p 120 Hz but when I enter the game (I've tried EA FC 24 and Fortnite) I still have 60 FPS. In Fortnite you have to turn on 120 FPS in settings but there is a problem - I don't have that option.

144hz is not a VESA standard timing, you may still have issues. It has to be real, not overclocked multiples of 30