If it is appearing like that as text (i.e. not source-code) you could try using Dreamweaver's 'search and replace' 'Entire Current Site' but choose 'Text' from the 'Search:' drop-down list, then click 'Find All'. That may flush it out.
Incidentally, If you just wanted to hide the 'Business Overview' heading from view, but without affecting the validation, or the ability to re-enter the CSFormBuilder edit area, you could just add a couple of inline styles to the html in your page.
The first change hides the 'Business Overview' heading, and the second one closes the gap that it leaves. Find this in your page html:
<li>
<fieldset class="Sharp_Default" id="Business_Overview">
<span class="groupHeader">Business Overview</span>
and change it to:
<li style="margin-top:-45px;">
<fieldset class="Sharp_Default" id="Business_Overview">
<span style="display: none;" class="groupHeader">Business Overview</span>
