I found a JavaScript work around that's working for us and I think it should be universal:
Edit your landing page, go to the Toolbox, hit the last tab and open the JavaScript editor. In the editor paste this code:
<script src="https://code.jquery.com/jquery-1.10.1.min.js"></script>
<script>
$(function(){
$("div.field-group-wrapper > label").hide();
});
</script>