Open the App Library by swiping left on the Home Screen until you reach the last page
Use the search bar at the top of the App Library to find the hidden app
Press and hold the app icon
Tap Add to Home Screen
Open Spotlight Search by swiping down on the Home Screen
Type the app name
Press and hold the app icon in the search results
Tap Add to Home Screen if available
Open the App Store
Tap your profile icon
Tap Purchased
Find the app and tap the download icon if it is not installed
Go to Settings
Tap Screen Time
Tap Content & Privacy Restrictions
Tap Allowed Apps
Turn the app back on if it is disabled
Go to Settings
Tap Home Screen
Set newly downloaded apps to appear on the Home Screen if needed
Check app folders on the Home Screen for the hidden app
Check the App Library categories for the hidden app
Restart the iPhone if the app still does not appear