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@belalmans: If you look at the bottom of the the viewfinder, you will see three numbers: .5, 1x and 3.
Tapping on .5 will enable the Ultra Wide camera, while tapping on 1x will activate the Wide Angle lens.
For Telephoto, tap on the number 3 to enlarge the subject. For high resolution images, tap the Aspect Ratio option at the top of the screen (in your image it currently shows 9:16), and select 3:4 64MP