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To prevent BBB conferences from being setup with incorrect attendee settings the following code can be added to hide the “Allow Attendees To…” selections when creating a BBB conference from within Canvas. This will only affect educator and administrator accounts. This is done to reduce the impact on students browsers. Add the following code to your Canvas theme JavaScript: 
////////////////////////////////////////////////////////
// Hide BigBlueButton Conferences "Allow Attendees To..." selections
////////////////////////////////////////////////////////

if(windowUrl.includes('/conferences') === true) {
  if(ENV.current_user_roles.indexOf('teacher') > 0 || ENV.current_user_roles.indexOf('admin') > 0) {
    $(document).click(function() {
      setTimeout(function() {
        $("span").each(function() {
          var text = $(this).text();
          if(text === 'Allow Attendees To...') {
            $(this).parent().parent().hide()
          }
        });
      }, 10);
    });
  }
}
Screenshot of Allow Attendees To… prior to implementing code. Screenshot of Allow Attendees To… post to implementing code.