Resetting the Home Screen Layout When all else fails, resetting the home screen layout will revert all apps to their default positions without deleting any data. Managing Hidden Apps with Screen Time If the app is still nowhere to be found, check if it has been hidden via Content & Privacy Restrictions.
Fix Grayed App Icon Cloud iPhone: Reactivate Your App
When the App is Deleted If the app does not appear in search results or the App Library, it may have been deleted. You can also long-press an app icon and selecting "Show App" to bring an icon back to the home screen.
Navigate to the last page of your home screen, where apps are sorted alphabetically. Open the App App Store, search for the app, and if it is grayed out with a cloud icon, it needs to be downloaded again.
Fix Grayed App Icon Cloud iPhone: Re-Download the App
Go to Settings > General > Transfer or Reset iPhone > Reset, then select "Reset Home Screen Layout. Verifying App Library Visibility The App Library, introduced in iOS 14, automatically organizes all your apps.
More About Lost app icon on iphone
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