To unhide apps on an iPhone running iOS 18 or later, follow these steps:

1. Go to the App Library
   From your Home Screen, swipe left past all your app pages until you reach the App Library.

2. Open the Hidden folder
   Scroll down to the bottom of the App Library and tap on the Hidden folder.

3. Authenticate
   Use Face ID, Touch ID, or your passcode to unlock and view the hidden apps.

4. Unhide the app
   Find the app you want to unhide, then long-press (touch and hold) its icon.
   Select Don’t Require Face ID (or Touch ID/Passcode) from the menu that appears.
   Authenticate again if prompted.

5. Return app to Home Screen (optional)
   After unhiding, if you want the app back on your Home Screen, long-press the app icon again and tap Add to Home Screen.

This process will move the app out of the Hidden folder and make it accessible without requiring Face ID or other authentication

. In summary, the key is to access the Hidden folder in the App Library, authenticate, and then disable the hiding requirement for the app to unhide it.