Create more room in your notebook

Add a page

Select Show Notebooks.
Select +Page.
Type a meaningful title for the page.

Add a section

To keep your pages organized, create a section.

Select Show Notebooks.
Select +Section.
Type a meaningful title for the section.

Add a notebook

Select Show Notebooks.
Select +Notebook.
Type a meaningful name and select Create Notebook.

Insert or remove extra space

Select Draw > Insert or Remove Extra Space.
Position the line where you want to add or remove space.
Drag to insert or remove extra space.

Source: Microsoft