The App Library is a new feature in iOS 14 that allows users to hide their apps without deleting them. You can remove every app from your home screen so you can customize it how you like, but have all the apps still installed available to you in the App Library.
Press and hold on an app on the home screen
Select "Move to App Library" to remove it from the home screen
Swipe to the right-most screen to view apps in the App Library