To turn off your manual shots (yellow), simply hold your finger over them. The box will expand briefly, then disappear.
To turn off face detection, go to the 'More Options' menu.
Tap the camera assistant icon to the far left.
Tap 'Find Faces' to turn it off (it should go from white to gray).
You can return to the live edit view by tapping the down arrow to the right, followed by the X icon. Now no faces will be detected automatically.