When you no longer need a particular notebook, you can remove it from your computer's hard drive.
Important: Once a notebook has been deleted, it cannot be recovered. Consider backing up your existing notebooks before deleting them.
Delete a OneNote notebook from your computer
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In File Explorer, navigate to your Documents folder, and then double-click OneNote Notebooks.
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In the OneNote Notebooks folder, right-click the name of the notebook you want to delete, and then click Delete.
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To remove the deleted files from your computer permanently, right-click the Recycle Bin on your computer’s desktop, and then choose Empty Recycle Bin.
Note: If your notebook is stored on OneDrive, see Delete a notebook from OneDrive. If you'd prefer to keep your notebook in the cloud for just you to use, you can simply stop sharing it or change who can view or edit it.