Here is a guide for clearing system and app cache memory for iPhones, which should be done periodically to remove unused and ...
If you want to unhide or remove a lock from an app, long press on the app, tap Don't Require Face ID and enter your Face ID or passcode. Your locked apps will now be unlocked and your hidden apps will ...
Closing iPhone apps generally isn't necessary, but can be useful if apps are misbehaving. Here's how to do it on any iPhone model.