Thanks to Ulrik the Android Connect missing setting menu has a workaround.
I’ve encountered the “Settings Menu is missing in Connect” bug multiple times. It seems to be related to having favorited your apps. All the apps that’s listed under favorites is missing this settings menu.
Having discovered this I’ve also found a better workaround than uninstalling the app (and thus losing all the settings), only tested on phone:
* Unfavorite the app
* Kill the Garmin Connect app on the phone
* Start the Garmin Connect app again and the settings menu should be present
* The app can the be configured once again. After configuration the app can be favorited again, but this will most likely cause the settings menu to disappear upon app (Garmin Connect) restart, which will the require using the workaround again.
Bug Posted in Garmin Forums