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 ...
If your iPad is frozen to the point that you can't reboot it the normal way, perform a forced restart. Charge the battery.
Apple has issued a warning to iPhone and iPad users to 'save your videos' after revealing it has discontinued its Clips app (first launched in 2017).