Thank you! This was driving me insane and your advice worked perfectly.
How do you erase the data fields? I can’t uninstall on my forerunner 235 either.
On my Edge 1030, the added data field (MyEdge2) shows up in an Activity Profile as Data Screen 4. That's kind of confusing until I scrolled thru the data screens I had configured for the profile and realized the added iQ data field was screen 4. I then deleted that from the activity profile. The way "this is supposed to work" is you add it on the Garmin Connect Mobile app, where you also configure how the iQ data field functions. There's an option to Uninstall and all that did was call an "Uninstall Error", so that was not helpful. Dumping in the device profile and then syncing the device shows the iQ app as uninstalled