To customize and format page backgrounds and templates for OneNote for Windows 10 on a Mac, it is necessary to do the following:

1. Pick a template – Choose from different designs for the notebook pages found on the right side of the OneNote page.
2. Select a background – Choose a nice design, an image or a solid color as the background.
3. Pick a font and font size – Select the desired font type and font size to apply to all the pages.
4. Create custom styles – To customize the look of text, click the Create a style box on the ribbon.