To customize and format lists and bullets in OneNote for Mac:

1. Select the list or bullets you want to change.
2. Select the Bullets tab in the Ribbon.
3. Choose the bullet style from the list.
4. To customize the bullet style, select Bullets and Numbering to open the Bullets and Numbering pane.
5. Choose a bullet or numbering style.
6. Optionally, if applicable, type a character or select a picture as the bullet, and assign a font formatting.
7. To change the size and color of the bullets, scroll down and select a color and a size.
8. To customize the spacing of the list, adjust the distances of the bullet’s margin and text.
9. When you’re finished, click OK.