@jkmf , I collect Fiesta also (post-86) and I haven't had any trouble finding Fiesta items.
I have never used category searches, because you never know what category a seller might have listed their items under. Just do a keyword search for what you're looking for, and it still works fine. Category searches always missed items. Especially if you were trying to use them to narrow down to Post-86 Fiesta only.
Realistically, there is no possible way to eliminate the pre-1973 Fiesta ware from a search, because many sellers have no idea of the difference, so they don't put the necessary information in the listing. And it was 50-50 if they got the item into the right category or not.
As a collector, you will have to eliminate those items yourself. With coffeepots, it's easy; the post-86 coffeepot shape is quite distinctive, with a small. The pre-1973 coffee pots either had large lids, or stick handles.
Here's a good search, almost all of these are Fiesta coffee pots:
fiesta (coffeepot, coffee pot, coffee server)
https://www.ebay.com/sch/i.html?_nkw=fiesta+%28coffeepot%2C+coffee+pot%2C+coffee+server%29&_sacat=0
