How to alphabetize on an IOS device?

I’m sorry, I misread your question. There is no way to natively alphabetize a list in Notes. You have to do it manually. You can change the order of items in the list using drag and drop, but I’m sure you know that if you use notes that much.

Sort by Title. Pull down on the list of Notes to get to the search bar. There is an option to Sort By, tap on that and select Title.