If you no longer need a OneNote 2016 notebook, you can delete it from your computer.
Important: After you delete a notebook, you may not be able to recover it. Always back up important notes before you delete them.
In File Explorer, navigate to your Documents folder, and then double-click OneNote Notebooks.
In the OneNote Notebooks folder, right-click the name of the notebook you want to delete, and then click Delete.
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.