In OneNote Online, you can add as much content to a page as you’d like — you’ll never run out of space. But when it’s time to organize your thoughts and ideas on separate pages, you can create as many new pages as you need.
At the bottom of the page list, click + Page.
Type a page title into the heading area at the top of the new page, and then press Enter.
You can organize pages by dragging their names up or down in the list.
Tip: If you accidentally create a page that you don’t need, right-click (PC) or Control-click (Mac) its name, and then click Delete.