It wasnt a setting, it was in the LUA and had to be edited. But yes it was a list of maps and I could edit it to add the map I was using. I cant seem to find that list now.
Viewing post in FS25 Realistic Livestock - Ritter version comments
I moved the constants out into a separate file: https://github.com/rittermod/FS25_RealisticLivestockRM/blob/953c764f8c530a3ee5f7d388366554ddda39184a/scripts/RLConstants.lua#L45