title: How to remove dots in Tableau filled map by zipcode
body: <p>When I generate filled map by zip code, I get these tiny dots. Besides cranking the opacity to 100% to mask them, is there a way to remove them from and only have a filled map?</p>
  
  <p><a href="https://i.stack.imgur.com/8wPIr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8wPIr.png" alt="enter image description here"></a></p>