As the manual says it should be there
Map Themes
You can change the map theme to display data optimized for your activity type.
Hold MENU, and select .
- None
-
Uses the preferences from the system map settings, with no additional theme applied.
- Marine
-
Sets the map to display data in marine mode.
- High Contrast
-
Sets the map to display data with higher contrast, for better visibility in challenging environments.
- Dark
-
Sets the map to display data with a dark background, for better visibility at night.
- Popularity
-
Highlights the most popular roads or trails on the map.
- Resort Ski
-
Sets the map to display the most relevant ski data at a glance.
- Aviation
-
Sets the map to display data in aviation mode.
As the other guys owning Enduro 2 for more time than me confirmed that earlier Map theme was in the menu in line with the manual: forums.garmin.com/.../1845302
Finally Iet me remark that I have been using Map Themes happily for years, since this feature was available for alll my Fenixes with maps.