Can't change resolution nvidia 390xx

i have the quadro 2000m gpu am new to linux. what i did was install with propietary drivers doing so in my case after it finished installation and ask to restart i would get a black screen.at the black screen enter tty and install kernel 5.10 then it boots and after that i can go back to default kernel.
my problem now is afte that i can only change resolution in nvidia settings but if i go like 720 it looks zoomed. i already asked for help waiting for a response.