AFAIK, this is only an issue with Controller Default Layout 12. Other Default Layouts seem unaffected.
Affects both PC and Xbox.
- Go into Difficulty Settings and set Shifting to ‘Automatic’.
- Go into Controls settings, Controller, and choose Default Layout 12.
- Notice that ‘Map’ is mapped to the View button.
- Go back to Difficulty Settings and set Shifting to ‘Manual’ (or Manual W/Clutch).
- Go back into Controls settings, Controller, and choose Default Layout 12.
- Notice that ‘Map’ is now unmapped.
FYI, this annoying issue has been present since at least Forza Horizon 4 launched.