Apple has a very simple solution for dealing with an unresponsive app on your iPhone and iPad ... Swipe the app you want to close. It will disappear from the carousel. Reopen the app.

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If you're using an iPhone, swipe up from the bottom of the screen to open the app switcher, then swipe up on the Facebook app ...

In my case, my iCloud notes section completely vanished and instead there was an empty ‘On my iPhone’ group. Force-quitting the Notes app made no difference. This happened in the same day as ...