A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
I had the same issue.
This was resolved in my case by tricking OneNote. If you have your OneNote Notebook location in OneDrive you cannot reach it directly (at least I don't know how to do that).
The following steps allowed me to delete my section group:
- click right on the notebook and select properties
- in the Properties windows, select change location. This will open a file dialog that will let you view the contents on OneDrive including a folder with the same name as your section group.
- select the folder with the section group name and delete it.
- the section group can now be deleted from within OneNote and will not return.
Hope this helps!