I believe it was in iOS 13 (or maybe 14?) that Apple introduced a sort of stacked card user interface, which allows you to swipe away this screen. See this screen recording: https://photos.app.goo.gl/4j9wynmECsA3jhfq6 So a back or cancel button isn’t necessary for devices running those versions of the operating system.
And yes, the Edit button does nothing, we should probably get rid of it.
I added an addendum about this to the relevant existing issue, but with the total mobile app redesign underway, I can’t say whether or not it will be implemented.