How to rename 'OSM World Routable' in Garmin RoadTrip? (Apple MAC)

how can I rename a map so it displays as other than ‘OSM World Routable’ in Garmin Roadtrip? This way I could use multiple OSM maps. for example tiles from different regions. Oh…Garmin Roadtrip is Apple Mac. I have tried everything and hit a wall with this one.

thanks for any suggestions!

Er, see here in response to the last time you asked this question:

Your original post was moved to the more appropriate Garmin maps sub-forum.

Oops. My mistake for not seeing that. Many thanks!