A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hi,
All your notebooks are stored in OneDrive, if there is no sync issue, I think you can go to OneNote onlinedirectly and find your notebook then click Open in OneNote.
If you can't find latest change in your notebook, I'm afraid it doesn't sync to OneDrive as you expected.
When you delete cache folder, all notebooks will be closed at same time in OneNote, if they haven't been sync properly to OneDrive, you will lost your latest changes, to avoid it happen in future, you need check sync status before close notebook or go to OneNote Online directly to find latest changes, another way is back up your notebook to another place.
Regards,
Eric