If you have a lot of notes, sorting their page or section tabs can make it easier to find what you are looking for. While there's no automatic way to sort these tabs alphabetically, you can do it manually by dragging the section or pages into the order you want.
Open the notebook whose sections or pages you want to sort alphabetically, numerically, or in some other order.
Drag the section or page tabs to the positions you want.
If you have more than one notebook, you can also change the order that these appear in your Notebooks list. Simply drag any of your notebook icons to the position you want.
Don't worry; changing the sort order of notebook, section, or page tabs won't break any links to your notes that you might have created.