There are times when developers want to hide the Visual or the WYSIWYG Editor from their Custom Post Types. If such is the case, add the following code in your functions.php to disable WYSIWYG editor in your Custom Post types and save the changes:

add_filter('user_can_richedit', 'disable_wysiwyg_for_CPT');
function disable_wyswyg_for_CPT($default) {
  global $post;
  if ('movie' == get_post_type($post))
    return false;
  return $default;

Thanks to Kaily Lampert