To comply with some recent changes from the Google Maps API team, we're no longer rendering map previews in the Designer. Now when you use the Map element, you'll see a generic preview of your map in the Designer, and will need to check out your published site to check how your map looks live.
Due to a new Google Maps policy, you’ll now see a generic map in the Designer when you use the Map element. But don’t worry: the real map will still display on your published site.