260,268d259
< @@ -73,7 +92,7 @@ class MenuBlock extends SystemMenuBlock {
<      ];
<  
<      // Open the details field sets if their config is not set to defaults.
< -    foreach(['menu_levels', 'advanced', 'style'] as $fieldSet) {
< +    foreach (['menu_levels', 'advanced', 'style'] as $fieldSet) {
<        foreach (array_keys($form[$fieldSet]) as $field) {
<          if (isset($defaults[$field]) && $defaults[$field] !== $config[$field]) {
<            $form[$fieldSet]['#open'] = TRUE;