Cannot find crosshair option

I have a koorui 27 inch curved gaming monitor and in the user manual there is an entire section named Game Mode which includes OD,Crosshair,Freesync Premium,MPRT,HDR , i am specifically looking for tge crooshair which i remember seeing the first tike i went in the monitor settings but now it is gone. I have tried looking in every setting but I still cannot find the crosshair option , any help ?