Hi @Y. Janssen ,
Welcome to Q&A forum!
Are you using the OneNote app or OneNote for Windows 10?
- If it is OneNote 2016 desktop app
How did you create the shared link? If you shared the link with anyone, you may be must to disable the sharing link and re-create a new.
For more information, please refer to: Stop sharing a notebook on OneDrive.
Besides, I suggest you can try to share the note with special users, that you can go to the shared notebook>Share>in Shared with section, right-click that user>to Remove User.
- If it is OneNote for Windows 10
Please note that the issues related to OneNote for Windows 10 are not supported in Q&A forum, it is recommended that you post a new question on the following forum for more professional support and help.
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Thanks for your understanding.
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