Being able to filter sections from a Pop-Up List is terrific, but it would be immeasurably better if we were able to select more than one item from the Pop-Up List.
I create columns so that each item can have the equivalent of a Tag, so that I can use Filters to search for certain things. If I want to assign multiple “tags” to an item, I have to use a Rich Text column so that more than one Tag can be applied. And this means that I have to manually type every tag for every item. It would save me an enormous amount of time if I could have all my tags in the Pop-Up List and select as many as I want for each item.
Ecco Pro had this function, and it was hugely useful.