App Library is a top-level screen that contains all the apps installed on your iPhone sorted by category. You can remove apps from your home screen (s), but still access them from App Library.

The App Library is a new way to organize your iPhone's apps, introduced in iOS 14. To find it, simply swipe all the way to the very last, rightmost page of your iPhone's home screen.

That’s because, if the location is incorrect or corrupted, you will notice the Library folder will cease to open. After installing Windows 11/10, you will find some folders such as Camera Roll ...