This was such a pain! Here is what you need to do:
1) On Garmin App: Click the Three dots ("More"), then Settings, then Connected Apps, then Disconnect MFP. Then Sync your device.
2) In MFP: Click the Three Dots ("More") then "Apps and Devices" and find garmin and disconnect. Then Return to HomeScreen and click the three dots again, then scroll down to click the "Sync", and let MFP Sync.
3) On Garmin Connect WEBSITE: log in. Select "Health Status" on the side navigation menu, then click "Calories In/Out" and select "Disconnect My Fitness Pal" towards the bottom of the screen, and then select "Disconnect".
4) THIS IS THE KEY: LOG OUT OF Garmin Connect app on your phone. Then Log back in!!! (Garmin Connect App will actually re-find and re-pair with your device... don't worry all of your data will pull back up as soon as it syncs/pairs... and the original default "Active and Resting" Calories will be there instead of the In/Out!!!