Is this on Tableau Server or Tableau Desktop? I was able to cut and paste into the search box in both Server and Desktop 8.1. The user might check to see that the quick filter type he is using is the Multiple Values (Custom List).
Hi Tracy, thanks so much for your reply. I think the problem was that it was a wildcard search, not a multiple values (custom list) box. I will work with the end-user to see if this solves it.