1) When you are on the map page, tap the Imagery & Overlays button.
2) On the Imagery & Overlays screen, the imagery you are currently seeing on your map has a green checkmark. The overlays that are active on your map are toggled to the right to show green.
3) Under Imagery, tap on any of the imagery to change which you are seeing on your map. Under Overlays, swipe the toggles to the right to turn that overlay on for your map. Swipe toggles to the left to turn that overlay off for your map.
*Note: To learn more about saving imagery, click here.