I have a form in the forms layout designer that has several tables in it, and I would like to remove the section label and the line that appear above them. I've highlighted the area in the screenshot.

I've tried using a couple of older answers' CSS to achieve this, but these do not seem to have worked:

#q30 .h2 {
  display : none !important;
}

#q30 .cf-section-header {display: none;}

.hidetbllbl h2 {display: none !important;}

.myTable .cf-section-header {display : none !important; }