there are two apps out now that allow full control over either camera. More can probably be found, but these two are the best. They are improving as we speak. I'm beta testing both. ProCam app and pro camera 8. You can swap to either camera anytime you want.! The default camera app sometimes switches when selected, but today the 2x camera did not activate in braud daylight! So there are still some bugs.
Pro camera:
ProCamera. by Cocologics
https://appsto.re/us/BN3zP.i
ProCam:
ProCam 4 - Manual Camera + RAW by Samer Azzam
https://appsto.re/us/zLCJR.i
Pro camera:
ProCamera. by Cocologics
https://appsto.re/us/BN3zP.i
ProCam:
ProCam 4 - Manual Camera + RAW by Samer Azzam
https://appsto.re/us/zLCJR.i