hi murderousmincepie,

you have to edit the config files that are in the “/opt/retropie” directory. You should have a “/opt/retropie/configs” folder at this location. If you don’t then something is going wrong with your Retropie installation :(

If this helps I’ve posted 2 of my config files in other posts:
https://www.petrockblock.com/forums/topic/xbox-controller-config/#post-15617

hope this helps.
cheers,