How disable App Library in iOS 14?

I don't think you can in 14.0 Just don't swipe to it, Ignore it.

Put in a feature request at https://www.apple.com/feedback/

Just guessin' they wont want to disable the main new feature

VAD. wrote:

They never reply. Fore some this is a feature, for others a mess!

They specifically state they don't reply to feedback. That doesn't mean they don't read it.