When i change nvidia-settings(with sudo) resolution from 1920x1080 to 2560x1440 on the advanced tab and click apply, it all works good, when i press save configurations it saves them into /etc/X11/xorg.conf when i open this file from the terminal it seems all updated correctly.
After rebooting everything resets, all the solutions found on internet about mint or other distros doesn't work for me