SW12 - doesn't have "mates in xxx section"

I'm looking at impacts of chaning from SW11 to SW12.  I put a complete duplicate copy of files in a separate directory to see what differences I find.  In Sw11 when I expand a part or subassembly there is the "mates in xxx section" folder, which is the only usefull way to be able to sort and edit mates.  In SW12 I get the folder in some parts and subassemblies, but not in others?  Is there a new setting to make that option always appear?  I can check the same part/subassembly in both the SW11 program and files and the SW12 program and files and SW11 always has the folder.

-Greg

SolidworksAssemblies