Create new Section in Factbox Area

I successfully used the Section Part to create new Groups and place them on my pages. When entering my Data I noticed I have the option to anchor my Section in the Factbox Area.

For Test purposes I created a new Field, created a new Section which I anchored with AddFirst to the factbox area and then anchored my new field with AddFirst to the new Section, unfortunately it does not work as I hoped. Are we doing something wrong or is this not possible at the moment?

Best Regards

Caner