March 28, 2018:
This is the #1 bug we are working on fixing. I believe we'll have an update pushed within a few weeks! As we work on resolving it, you may need to deactivate the plugin until your page is built. Or you may just need to use the Classic builder. Thanks for your patience!
March 29, 2018:
This issue has been RESOLVED. Version 1.1.1 (or later) resolves this issue. The header hides/disables itself when in visual builder mode.