OneNote for Mac uses the 11-point Calibri font for new notes you create, but you can easily change this default formatting to suit your needs.
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On the top menu bar, click OneNote, and then click Preferences.
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In the OneNote Preferences dialog box that opens, click Edit & View.
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Under Default font, select the Font and Size that you want OneNote to use.
Notes:
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Your new default font and size choices apply only to new notes that you’ll write from now on. Existing notes won’t be reformatted automatically.
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You cannot change the formatting of existing notes automatically by changing styles.
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Changing the default font size applies to note text only — not to page titles.