Adjusting the ink color and thickness in OneNote for Mac is a simple process.

1. In the top menu bar, select View > Ruler to enable the ruler at the top of your page.
2. From the Draw menu, select the Ink Color that you would like to use.
3. Select Ink Thickness from the Draw menu.
4. Place two fingers on your trackpad to squeeze if you would like to decrease the thickness and stretch to increase the thickness of your ink.