Issue #3390478: Change weight

navigation.module

 <?php
 
+use Drupal\Component\Utility\SortArray;
 use Drupal\Core\Url;
 
 /**
@@ -16,7 +17,9 @@ function navigation_preprocess_html(array &$variables) {
     $menu[$definition['region']][$id] = $instance->getMenuItems();
     $menu[$definition['region']][$id]['#weight'] = $definition['weight'];
   }
-
+  foreach ($menu as $region => $region_data) {
+    uasort($region_data, [SortArray::class, 'sortByWeightElement']);
+  }
   $variables['page_top']['navigation'] = [
     '#theme' => 'navigation',
     '#menu_middle' =>  $menu['middle'],

src/Plugin/Navigation/NavigationAdmin.php

@@ -13,6 +13,7 @@ use Drupal\navigation\NavigationSectionInterface;
  *   id = "admin",
  *   title = "Administration",
  *   region = "middle",
+ *   weight = 5,
  * )
  */
 class NavigationAdmin extends PluginBase implements NavigationSectionInterface {

templates/navigation.html.twig

@@ -31,9 +31,7 @@
       </div>
 
       {{ menu_top }}
-      {% for section in menu_middle %}
-        {{ section }}
-      {% endfor %}
+      {{ menu_middle }}
     </nav>
 
     {# @todo - This sticky menu should exist under the <nav> landmark element above. #}