I think this is a regression from https://phabricator.wikimedia.org/T217937.
- Cold launch Wikipedia to the Explore feed. (So before you force quit, ensure you're on the explore feed.)
- Tap Settings gear.
- Swipe in from leading side of screen (the back behavior, except there isn't actually anywhere to go back to).
- You're now stuck in Settings screen - can't close out, can't select any TableViewCell.
Tested on both Touch ID an Face ID phones, both had this bug. (iPhone SE 2nd gen w/ iOS 14, iPhone 12 w/ iOS 15)