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diff --git a/web/core/modules/settings_tray/src/Form/SystemMenuOffCanvasForm.php b/web/core/modules/settings_tray/src/Form/SystemMenuOffCanvasForm.php
new file mode 100644
index 000000000..71e152361
--- /dev/null
+++ b/web/core/modules/settings_tray/src/Form/SystemMenuOffCanvasForm.php
@@ -0,0 +1,154 @@
+<?php
+
+namespace Drupal\settings_tray\Form;
+
+use Drupal\Component\Plugin\PluginInspectionInterface;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\PluginFormBase;
+use Drupal\Core\Render\Element;
+use Drupal\Core\Routing\RedirectDestinationTrait;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\StringTranslation\TranslationInterface;
+use Drupal\system\MenuInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * The off-canvas form handler for the SystemMenuBlock.
+ *
+ * @see settings_tray_block_alter()
+ *
+ * @internal
+ */
+class SystemMenuOffCanvasForm extends PluginFormBase implements ContainerInjectionInterface {
+
+  use StringTranslationTrait;
+  use RedirectDestinationTrait;
+
+  /**
+   * The plugin.
+   *
+   * @var \Drupal\Core\Block\BlockPluginInterface
+   */
+  protected $plugin;
+
+  /**
+   * The menu entity that the block uses and that will be edited in this form.
+   *
+   * @var \Drupal\system\MenuInterface
+   */
+  protected $menu;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $menuStorage;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * SystemMenuOffCanvasForm constructor.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $menu_storage
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
+   */
+  public function __construct(EntityStorageInterface $menu_storage, EntityTypeManagerInterface $entity_type_manager, TranslationInterface $string_translation) {
+    $this->menuStorage = $menu_storage;
+    $this->entityTypeManager = $entity_type_manager;
+    $this->stringTranslation = $string_translation;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity_type.manager')->getStorage('menu'),
+      $container->get('entity_type.manager'),
+      $container->get('string_translation')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form = $this->plugin->buildConfigurationForm([], $form_state);
+    // Move the menu levels section to the bottom.
+    $form['menu_levels']['#weight'] = 100;
+
+    $form['entity_form'] = [
+      '#type' => 'details',
+      '#title' => $this->t('Edit menu %label', ['%label' => $this->menu->label()]),
+      '#open' => TRUE,
+      '#access' => $this->menu->access('edit'),
+    ];
+    $form['entity_form'] += $this->getEntityForm($this->menu)->buildForm([], $form_state);
+
+    // Print the menu link titles as text instead of a link.
+    if (!empty($form['entity_form']['links']['links'])) {
+      foreach (Element::children($form['entity_form']['links']['links']) as $child) {
+        $title = $form['entity_form']['links']['links'][$child]['title'][1]['#title'];
+        $form['entity_form']['links']['links'][$child]['title'][1] = ['#markup' => $title];
+      }
+    }
+    // Change the header text.
+    $form['entity_form']['links']['links']['#header'][0] = $this->t('Link');
+    $form['entity_form']['links']['links']['#header'][1]['data'] = $this->t('On');
+
+    // Remove the label, ID, description, and buttons from the entity form.
+    unset($form['entity_form']['label'], $form['entity_form']['id'], $form['entity_form']['description'], $form['entity_form']['actions']);
+    // Since the overview form is further nested than expected, update the
+    // #parents. See \Drupal\menu_ui\MenuForm::form().
+    $form_state->set('menu_overview_form_parents', ['settings', 'entity_form', 'links']);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $this->plugin->validateConfigurationForm($form, $form_state);
+    $this->getEntityForm($this->menu)->validateForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $this->plugin->submitConfigurationForm($form, $form_state);
+    $this->getEntityForm($this->menu)->submitForm($form, $form_state);
+    $this->menu->save();
+  }
+
+  /**
+   * Gets the entity form for this menu.
+   *
+   * @param \Drupal\system\MenuInterface $menu
+   *   The menu entity.
+   *
+   * @return \Drupal\Core\Entity\EntityFormInterface
+   *   The entity form.
+   */
+  protected function getEntityForm(MenuInterface $menu) {
+    $entity_form = $this->entityTypeManager->getFormObject('menu', 'edit');
+    $entity_form->setEntity($menu);
+    return $entity_form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setPlugin(PluginInspectionInterface $plugin) {
+    $this->plugin = $plugin;
+    $this->menu = $this->menuStorage->load($this->plugin->getDerivativeId());
+  }
+
+}