Pages and sections in OneNote for Windows 10 are very similar to pages and sections in the OneNote for Microsoft Store app you might be used to from Windows 8.
What’s the same
Working with pages and sections is virtually the same.
Adding a page — Select the + Page button at the bottom of the page list.
Adding a section — Select the + Section button at the bottom of the section list.
Section groups are now listed under their notebook name. When you select a section group, you’ll see all the sections together in that group.
Open a section group
To get to a section group, click the Show Notebooks button .
In the pane that appears, select the section group under its associated notebook.