This policy setting allows you to turn off version history which includes versions and the notebook recycle bin. With a 2010 ...

This policy setting allows you to turn off version history which includes versions and the notebook recycle bin.  With a 2010 format notebook, OneNote will automatically store previous versions of the pages in the notebook, and it will also store a recycle bin for all of the deleted pages and sections.

If you enable this policy setting, it will turn off version history.

If you disable or do not configure this policy setting, OneNote will store previous versions by default.