.../EntityReferenceEntityFormatter.php             | 26 +++++++++++++++++-----
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceEntityFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceEntityFormatter.php
index e57cefd..e685317 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceEntityFormatter.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceEntityFormatter.php
@@ -9,6 +9,7 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Logger\LoggerChannelFactoryInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Render\Markup;
 use Drupal\Core\Url;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -132,8 +133,13 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
     $entity_type_id = $this->getFieldSetting('target_type');
     $bundle_entity_type_id = $this->entityTypeManager->getDefinition($entity_type_id)->getBundleEntityType();
     $bundles = array_keys($this->getFieldSetting('handler_settings')['target_bundles']);
+    $description = [
+      '#theme' => 'item_list',
+      '#context' => ['list_style' => 'comma-list'],
+      '#items' => [],
+    ];
     if (count($bundles) === 1) {
-      $description = [
+      $description['#items'][] = [
         '#type' => 'link',
         '#title' => $this->t('Configure view modes'),
         '#url' => Url::fromRoute(sprintf('entity.entity_view_display.%s.default', $entity_type_id), [$bundle_entity_type_id => $bundles[0]]),
@@ -148,11 +154,6 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
     }
     else {
       $bundle_info = entity_get_bundles($entity_type_id);
-      $description = [
-        '#theme' => 'item_list',
-        '#context' => ['list_style' => 'comma-list'],
-        '#items' => [],
-      ];
       for ($i = 0; $i < count($bundles); $i++) {
         $description['#items'][] = [
           '#type' => 'link',
@@ -168,6 +169,19 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
         ];
       }
     }
+    $description['#items'][] = [
+      '#type' => 'link',
+      '#title' => $this->t('Add new view mode'),
+      '#prefix' => Markup::create(t('or') . '&nbsp'),
+      '#url' => Url::fromRoute('entity.entity_view_mode.add_form', ['entity_type_id' => $entity_type_id]),
+      '#attributes' => [
+        'class' => ['use-ajax'],
+        'data-dialog-type' => 'modal',
+        'data-dialog-options' => json_encode([
+          'width' => 800,
+        ]),
+      ],
+    ];
     $elements['view_mode'] = [
       '#type' => 'select',
       '#options' => $this->entityDisplayRepository->getViewModeOptions($entity_type_id),