If you make a hash of the OneNote 2013 ribbon and want to start over, you can reset your customizations. By resetting your customizations, you get the default ribbon back, but you lose any new tabs, groups, or commands that you added to the ribbon.
Right-click anywhere on the ribbon. On the shortcut menu that appears, click Customize the Ribbon.
In the Customize The Ribbon window of the OneNote Options dialog box, in the Customize The Ribbon section, click Reset.
On the menu that appears, click Reset All Customizations.
In the pop-up message box asking to confirm the deletion, click Yes.
Click OK.
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