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Select the File tab and select Options.
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In the OneNote Options dialog box, under Default font, select a font, font size, and font color, and select OK.
Note: The new default font applies only to new pages and content and affects only notes, not page titles.
Changing the default font for the entire app isn't currently possible in OneNote for the web.
You can change the font for a single page.
You can change default font in the desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the app? Get it for free in the Microsoft Store.
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On the top menu bar, select OneNote and choose Preferences.
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In the OneNote Preferences dialog box that opens, select Edit & View.
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Under Default font, select a font and size.
Note: The new default font applies only to new pages and content and affects only notes, not page titles.