webheadllc on "[Plugin: Contact Form 7 Multi-Step Forms] Accessing to Second Form Without Filling Out First Form"

You can try add the following to your functions.php file. I don't know if it will work since I haven't tried it. If this doesn't work the it can't be done without modifying the plugin code.

function cf7msm_no_message() {
  return null;
}
add_filter('wh_hide_cf7_step_message', 'cf7msm_no_message');