Try these steps: They were used in Office versions 2010 and 2003 I believe.
1) First, right-click anywhere in the Quick Access tool bar (located below File, Edit tabs)
Select "Customize Quick Access Tool Bar" option.
Under "Choose Commands From", click drop down menu and select "Popular Commands."
In window below, scroll down and select "Ink Styles". To the right of the window, click "Add."
"Ink Styles" should now appear in the window to the right. Click "OK" at bottom of window.
In the main screen of OneNote, click the "Ink Styles" icon (looks like three diff. colored pens) and hover over each of the pens under "Favorite Pens". When you hover, the pen thickness will appear in small grey box.
The thinnest pen size is 0.25 mm. To make it one of your accessible favorite pens (Numbered 1-8), right click the thinnest pen and click "move up."
Repeat above step until thin pen is at position #1. This is now "Favorite Pen 1".
2) On the Standard toolbar, click the arrow next to Pen
,
and then, on the shortcut menu, click the felt-tip pen or highlighter that you want to customize.
Click the arrow next to the Pen button again, and then click Customize Current Pen.
In the Customize Current Pen dialog box, do any of the following:
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In the Pen name box, type a new name for the current pen.
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In the Pen color list, click a new color for the current pen.
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In the Pen thickness (mm) list, enter a new stroke size (in millimeters) for the current pen.