If you want fixed 1080p and nothing else in ryujinx (or yuzu)... you take the disabling dynamic res patch from the first post (under Spoiler: patches made by the community) and put it in the mods folder like so:
MOD_NAME/exefs/A7643F3B7D8EE906BDFE18C3DDBA42A300000000000000000000000000000000.ips...