You can keep your notebooks organized by arranging your section tabs and page tabs in a meaningful order.
Rearrange section tabs
Section tabs run across the top of your notebook and are a great way to organize things by content or topic. You can change the order of sections anytime.
In the row of sections near the top of the current page, click a tab and drag it left or right until it's where you want it.
A small arrow will appear in the spaces between other sections as you move the mouse, so you’ll know where the tab will end up when you release the mouse button.
Tip: If you make a mistake, press Ctrl+Z to undo your changes and try again.
You can add new sections and create section groups to help you stay organized. Section groups let you combine sections into a group of their own, which makes it easier to navigate through section tabs in large notebooks.
Rearrange page tabs
Page tabs run down the side of your notebook and are a helpful way to organize content in a section.
In the page tabs column on the side of the current page, click a page tab and drag it up or down until it's where you want it.
A horizontal bar will appear in the spaces between other pages as you move the mouse so you’ll know where the tab will end up when you release the mouse button.
Note: OneNote doesn't automatically organize your section or page tabs by certain criteria. For example, it doesn't alphabetize your section tabs or sort your page tabs in chronological order.