I’m having problems adjusting the screen size. I’ve ran different o.s. through raspberry pi and most need to be set to -6 from the default screen size(running through hdmi to a T.V.) However, for the life of me, I can’t figure out how to do it through the GUI in Retropie. I don’t know if I can’t find the right settings page or if this has to be done through modify start-up files manually. Any help or advice would be greatly appreciated