It would be intuitive if Zones were displayed and activated from the Sections grouping that already exists in the Model Tree.
Zones are created via the 'Section' cascade in the Model tab in the ribbon, are named with the same XSEC naming convention, and are listed in the 'Section' tab in the View Manager - so I think it makes sense that they should also exist in the same place in the Model Tree.
Due to this inconsistency you can also only activate Zones via the View Manager, whereas you can activate other sections from the Model Tree.
See below, showing zone sections XSEC0001 and XSEC0002 being categorised as Footer items, alongside a planar section as a Section item.
