To remove, drag these to the Trash:
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The Microsoft OneNote app from the Applications folder.
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OneNote icon from the Dock.
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All files and folders that begin with “com.microsoft.onenote” from the Library\Containers folder.
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Restart your computer.
Note: The Library folder isn’t visible in Finder. To go to it, open the Go menu and hold down the OPTION key.
Warning: This step will remove all user data, include your notebook content. Please be sure to sync any changes you want to keep before proceeding.