In OneNote Online, you can add as much content to a page as you’d like—you’ll never run out of space. If you’d like to get organized, you can create additional pages at any time.
On the left side of the screen, over the column of page tabs, choose Add Page.
Type a page title into the heading area at the top of the page, and then press Enter.
You can organize pages by dragging their tabs up or down in the page tabs column and by adding subpages.
Tip: If you accidentally create a page that you don’t need, right-click its page tab and then click Delete.