Reply To: I can't change the header. And the elements don't work for me.

Try to add the following PHP code snippet to the child theme functions.php file to fix this

add_action('admin_head', 'xts_widget_fix');

function xts_widget_fix() {
  echo '<style>
.xhb-edit-tabs > div:first-child:last-child {
  display: block!important;
}
  </style>';
}