Unless you're connecting your Pi using a composite cable to your TV (which seems unlikely, since that won't do 1080), NTSC/PAL is not an issue for TV's video resolution.
Use raspi-config to choose your desired video resolution globally or modify your /boot/config.txt according to the Raspbery Pi video doc.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first