I’m not too sure if this is a feature already implemented, but I could not figure out for the life of me how to have a lightbox pop up immediately, and essentially block my content without filling out the form. I wasn’t sure what to search for: Welcome Gate, Content Block etc… but with the help of Robert on the support team, we came up with a nifty workaround:
We took my landing page at http://newpatients.digisearch.com/, and copied the page in one image. Then I recreated a landing page of that page as one flat image as the background. I used an overlay to darken it and added a form. Using css from Robert, I kept the form floating in the center of the screen, and then redirected entrants to my NEW landing page http://newpatients.digisearch.com/special/
a little tedious, but I think it could be solved by allowing a lightbox feature in the builder… just a thought.