diff --git a/src/Plugin/Field/FieldWidget/ParagraphsWidget.php b/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
index edb24b9..4300f05 100644
--- a/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
+++ b/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
@@ -1624,13 +1624,20 @@ class ParagraphsWidget extends WidgetBase {
     $field_name = $this->fieldDefinition->getName();
     $field_title = $this->fieldDefinition->getLabel();
     $setting_title = $this->getSetting('title');
+    $select_options = $this->getAccessibleOptions();
     $add_more_elements['add_more_select'] = [
       '#type' => 'select',
-      '#options' => $this->getAccessibleOptions(),
+      '#options' => $select_options,
       '#title' => $this->t('@title type', ['@title' => $setting_title]),
       '#label_display' => 'hidden',
     ];
 
+    // Do not present the select element if only one option is available.
+    if (count($select_options) === 1) {
+      $add_more_elements['add_more_select']['#type'] = 'value';
+      $add_more_elements['add_more_select']['#value'] = key($select_options);
+    }
+
     $text = $this->t('Add @title', ['@title' => $setting_title]);
 
     if ($this->realItemCount > 0) {
diff --git a/tests/src/Functional/ParagraphsExperimentalUiTest.php b/tests/src/Functional/ParagraphsExperimentalUiTest.php
index f4d24d2..b21e2c0 100644
--- a/tests/src/Functional/ParagraphsExperimentalUiTest.php
+++ b/tests/src/Functional/ParagraphsExperimentalUiTest.php
@@ -98,4 +98,40 @@ class ParagraphsExperimentalUiTest extends BrowserTestBase {
     $this->assertSession()->responseContains('class="paragraphs-description paragraphs-collapsed-description"><div class="paragraphs-content-wrapper"><span class="summary-content">This is a title');
   }
 
+  /**
+   * Tests 'Select list' add mode logic.
+   */
+  public function testAddModeSelect() {
+    $this->loginAsAdmin();
+    $this->addParagraphedContentType('paragraphed_test', 'paragraphs');
+
+    $this->addParagraphsType('test_paragraph');
+    $this->addParagraphsType('text');
+    $this->addFieldtoParagraphType('text', 'field_text_demo', 'text');
+    $settings = [
+      'add_mode' => 'select',
+      'edit_mode' => 'closed',
+      'closed_mode' => 'summary',
+    ];
+    $this->setParagraphsWidgetSettings('paragraphed_test', 'paragraphs', $settings, 'paragraphs');
+    $this->drupalGet('node/add/paragraphed_test');
+    $this->assertSession()->selectExists('paragraphs[add_more][add_more_select]');
+
+    $edit = [
+      'settings[handler_settings][negate]' => 0,
+      'settings[handler_settings][target_bundles_drag_drop][text][enabled]' => 1,
+    ];
+    $this->drupalPostForm('admin/structure/types/manage/paragraphed_test/fields/node.paragraphed_test.paragraphs', $edit, 'Save settings');
+
+    $this->drupalGet('node/add/paragraphed_test');
+    $this->assertSession()->fieldNotExists('paragraphs[add_more][add_more_select]');
+    $this->getSession()->getPage()->findButton('paragraphs_add_more')->press();
+    $edit = [
+      'title[0][value]' => 'Demo text title',
+      'paragraphs[0][subform][field_text_demo][0][value]' => 'Demo text for the detail page',
+    ];
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    $this->assertSession()->pageTextContains('Demo text for the detail page');
+  }
+
 }