Hide selections that have no value

Hello, I am very new to QS and have a set of 4 visuals that are anchored by a date range. One of the filters is by city. How can I hide cities that have no activity within the date range selected from the dropdown filter if a user wants to search by city after they select their date range? For now, I just get “There was no data found in the visual” as a message.

In the Format control of your dropdown selector there this option of “Show relevant values only”. Does the trick I think ;).