Maybe it’s a need-a-license thing, or people-seldom-used-it thing - so it’s gone. But once in a while, those pre-set Avery Forms would come in handy. The three cases I can think of were On-Demand business cards, small and large envelopes, and event placeholders.
I don’t see it as a PanX “New Form” option. Is it in an example/tutorial somewhere?
It’s easy enough to copy the desired dimensions from Pan6 and to create the form in PanX. But I wondering if a file with those Avery pop-up form options is in some corner of Examples or Uploads in PanX?