Hi @Darius Vesa
I suggest you open the notebook. Select the ‘History’ tab > ‘Recent Edits' > 'All Pages Sorted by Date".
References:
See a list of recent changes in a notebook in OneNote for Windows
Show authors in a shared notebook in OneNote for Windows
To stop sharing (un-link) your notebook, please open this notebook via OneNote desktop app, then click 'Share' > 'Manage Access', choose to remove one or more People, or remove and disable your __Links__.
The reference:
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