On both Mac and Windows, the Garmin app simulator has an entire folder structure which looks just like the file system on the device, which lives in the user's temp directory.
On Mac, the following steps should work:
- In Terminal.app, type: open $TMPDIR/Garmin/
That should open the sim's folder in Finder.
- From there, navigate to apps/settings
Or in one step: open $TMPDIR/Garmin/apps/settings
If you sideload your app to a real device, you can copy the settings file found in the above folder to the device, for testing purposes. Not as convenient as changing the settings on your phone (which only works for apps uploaded to the store), but it works.