How do I unhide an app on iPhone?

persuaded.mix ~ See the section 'Unhide an app' here:

Lock or hide an app on iPhone - Apple Support

...Found by searching Apple's Knowledge Base

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Probably some pages may be hidden

Here's how to hide/unhide a page:

1. Touch and hold an empty area on your Home Screen.
2. Tap the dots near the bottom of your screen.
3. Tap and Tick the circle under the page that you want to unhide.
4. Tap Done.

Please see the pic below which is self-explanatory

You may --> Organize the Home Screen and App Library on your iPhone