My Oasis3 finally started some shows of series. I think it came in junks. Still I see no filtering by series groups. But I found all the series at the end of all the pages. I have sorted by collections and that brings up the downloaded collections followed by the books not in those collections. I always have "ALL"on.
The series are at after all the books not in collections. So I have 473 pages and when click on that number bottom right, I go type in go to 473 page and it shows all the series groups. Going backwards from there. But as soon as I click on one, it brings it up to front (page1) as recent. So they are going to be mixed in after a while with no filter options.
At least I found them all for now. Just can't click on them.