How to Filter and Sort for Omnibus Collections?

Apologies if I’m missing something obvious but is there any way to filter & sort so I can just view the Omnibus collections? I can search on “Omnibus” and the resulting page Search | DC UNIVERSE INFINITE seems to list all collected volumes but I don’t see any way to filter or sort the results.

It would also be nice to have an option on the main Browse page at Browse All DC Comics Online | DC UNIVERSE INFINITE to be able to drill down to see newer collections, or collections for a certain character / time period / etc.