The gallery's filters should actually filter content.

Took me a while to figure this out but you don't really need filtering option for packs, it seems packs you don't have in gallery show up as 3 gems in a green icon. So if that pop on any gallery ones it would seem there a pack you don't have, then seems you can browse it and see details and show items to see which specific items you don't have weight if they're worth getting or you can replace them.

Which makes me wonder why gallery functions aren't better explained and they don't just remove filtering for packs all together as they're broken to removing gallery popups you don't have anyways?