diff -u b/config/schema/paragraphs_collection.schema.yml b/config/schema/paragraphs_collection.schema.yml
--- b/config/schema/paragraphs_collection.schema.yml
+++ b/config/schema/paragraphs_collection.schema.yml
@@ -11,9 +11,6 @@
           default:
             type: string
             label: 'Default group style'
-    default:
-      type: string
-      label: Default style
 
 paragraphs.behavior.settings.grid_layout:
   type: paragraphs.behavior.settings_base
diff -u b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
--- b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
+++ b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
@@ -161,7 +161,8 @@
     ];
     // @todo: Remove getCompleteFormState() after https://www.drupal.org/project/drupal/issues/2798261.
     $group_key = ['behavior_plugins', $this->getPluginId(), 'settings', 'groups'];
-    $groups = $form_state->getCompleteFormState()->getValue($group_key, $this->configuration['groups']);
+    $groups = $form_state->getCompleteFormState()
+      ->getValue($group_key, $this->configuration['groups']);
     $form['groups_defaults'] = [
       '#type' => 'container',
       '#prefix' => '<div id="style-wrapper">',
@@ -250,18 +251,25 @@
     }
   }
 
-   /**
-    * {@inheritdoc}
-    */
-   public function settingsSummary(Paragraph $paragraph) {
-     $styles = $this->yamlStyleDiscovery->getStyleOptions();
-     if ($style = $paragraph->getBehaviorSetting($this->getPluginId(), 'style')) {
-       if ($style != $this->configuration['default']) {
-         return [$this->t('Style: @style', ['@style' => $styles[$style]])];
-       }
-     }
-     return [];
-   }
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary(Paragraph $paragraph) {
+    $style_options = $this->yamlStyleDiscovery->getStyleOptions();
+    $summary = [];
+    if ($styles = $paragraph->getBehaviorSetting($this->getPluginId(), 'styles')) {
+      foreach ($styles as $group_id => $style) {
+        if (!isset($this->configuration['groups'][$group_id]) || $style != $this->configuration['groups'][$group_id]['default']) {
+          $summary[] = $this->t('@group: @style', [
+            '@group' => $this->yamlStyleGroupDiscovery->getGroupLabel($group_id),
+            '@style' => $style_options[$style]
+          ]);
+        }
+      }
+      return [implode($summary, ', ')];
+    }
+    return [];
+  }
 
   /**
    * Ajax callback for loading the style description for the currently
@@ -304,7 +312,8 @@
     if ($paragraph->getParagraphType()->hasEnabledBehaviorPlugin('style')) {
       $defaults = $paragraph->getParagraphType()->getBehaviorPlugin('style')->getConfiguration()['groups'];
       if ($paragraph_style = $paragraph->getBehaviorSetting('style', ['styles', key($defaults)], reset($defaults)['default'])) {
-        $style = \Drupal::service('paragraphs_collection.style_discovery')->getStyle($paragraph_style);
+        $style = \Drupal::service('paragraphs_collection.style_discovery')
+          ->getStyle($paragraph_style);
         if (!empty($style['template'])) {
           return $style['template'];
         }
diff -u b/src/StyleGroupDiscovery.php b/src/StyleGroupDiscovery.php
--- b/src/StyleGroupDiscovery.php
+++ b/src/StyleGroupDiscovery.php
@@ -117,6 +117,13 @@
   }
 
   /**
+   * {@inheritdoc}
+   */
+  public function getGroupId($group_label) {
+    return strtolower(str_replace(' ', '_', $group_label));
+  }
+
+  /**
    * Gets the YAML discovery.
    *
    * @return \Drupal\Core\Discovery\YamlDiscovery
diff -u b/src/StyleGroupDiscoveryInterface.php b/src/StyleGroupDiscoveryInterface.php
--- b/src/StyleGroupDiscoveryInterface.php
+++ b/src/StyleGroupDiscoveryInterface.php
@@ -30,2 +30,13 @@
 
+  /**
+   * Gets group label.
+   *
+   * @param string $group_label
+   *   The group label.
+   *
+   * @return string
+   *   The group id.
+   */
+  public function getGroupId($group_label);
+
 }
diff -u b/src/Tests/ParagraphsStylePluginTest.php b/src/Tests/ParagraphsStylePluginTest.php
--- b/src/Tests/ParagraphsStylePluginTest.php
+++ b/src/Tests/ParagraphsStylePluginTest.php
@@ -57,7 +57,11 @@
     $this->assertText('Style groups field is required.');
     $edit = [
-      'behavior_plugins[style][enabled]' => TRUE,
       'behavior_plugins[style][settings][groups][]' => ['regular_test_group'],
     ];
+    $this->drupalPostAjaxForm(NULL, $edit, 'behavior_plugins[style][settings][groups][]');
+    $edit = [
+      'behavior_plugins[style][settings][groups][]' => ['regular_test_group'],
+      'behavior_plugins[style][settings][groups_defaults][regular_test_group][default]' => '',
+    ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
 
@@ -67,7 +71,7 @@
 
     // Check that we have style plugin.
     $this->assertText('Style');
-    $this->assertField('paragraphs[0][behavior_plugins][style][style_wrapper][style]');
+    $this->assertField('paragraphs[0][behavior_plugins][style][style_wrapper][styles][regular_test_group]');
 
     // Check that the style options are sorted alphabetically.
     $styles = $this->xpath('//select[contains(@id, :id)]', [':id' => 'edit-paragraphs-0-behavior-plugins-style-style']);
@@ -82,9 +86,16 @@
       'behavior_plugins[style][enabled]' => TRUE,
       'behavior_plugins[style][settings][groups][]' => ['italic_test_group'],
     ];
+    $this->drupalPostAjaxForm(NULL, $edit, 'behavior_plugins[style][settings][groups][]');
+    $edit = [
+      'behavior_plugins[style][settings][groups][]' => ['italic_test_group'],
+      'behavior_plugins[style][settings][groups_defaults][italic_test_group][default]' => '',
+    ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
     // Check that the style without a style group is no longer available.
     $this->drupalGet('node/add/paragraphed_test');
+    $this->drupalPostAjaxForm(NULL, [], 'paragraphs_test_style_plugin_add_more');
+
     // Since Italic Group defines only two styles, assert that only they appear.
     $styles = $this->xpath('//select[contains(@id, :id)]', [':id' => 'edit-paragraphs-0-behavior-plugins-style-style']);
     $this->assertEqual(3, count($styles[0]->option));
@@ -94,14 +105,14 @@
 
     // Configure Regular as a default style.
     $this->drupalGet('admin/structure/paragraphs_type/' . $paragraph_type);
-    $this->assertFieldByName('behavior_plugins[style][settings][defaults][italic_test_group]');
+    $this->assertFieldByName('behavior_plugins[style][settings][groups_defaults][italic_test_group][default]', '');
     $edit = [
       'behavior_plugins[style][settings][groups][]' => ['regular_test_group'],
     ];
     $this->drupalPostAjaxForm(NULL, $edit, 'behavior_plugins[style][settings][groups][]');
     $edit = [
       'behavior_plugins[style][settings][groups][]' => ['regular_test_group'],
-      'behavior_plugins[style][settings][defaults][regular_test_group]' => 'regular',
+      'behavior_plugins[style][settings][groups_defaults][regular_test_group][default]' => 'regular',
     ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
 
@@ -129,7 +140,7 @@
     // Assert default value for the style selection.
     $node = $this->getNodeByTitle('style_plugin_node');
     $this->drupalGet('node/' . $node->id() . '/edit');
-    $this->assertFieldByName('paragraphs[0][behavior_plugins][style][style_wrapper][regular_test_group]', 'regular');
+    $this->assertFieldByName('paragraphs[0][behavior_plugins][style][style_wrapper][styles][regular_test_group]', 'regular');
   }
 
   /**
@@ -177,22 +188,26 @@
     $this->assertEqual([], $style_plugin->settingsSummary($paragraph));
 
     // Use bold style for this container.
-    $paragraph->setBehaviorSettings('style', ['style' => 'bold']);
+    $paragraph->setBehaviorSettings('style', ['styles' => ['bold_test_group' => 'bold']]);
     $paragraph->save();
-    $this->assertEqual(['Style: Bold'], $style_plugin->settingsSummary($paragraph));
+    $this->assertEqual(['Bold Test Group: Bold'], $style_plugin->settingsSummary($paragraph));
 
     // Check the settings summary in a closed mode.
     $this->setParagraphsWidgetMode('paragraphed_test', 'field_paragraphs', 'closed');
     $this->drupalGet('node/' . $node->id() . '/edit');
     $this->assertRaw('edit-field-paragraphs-0-top-icons');
-    $this->assertRaw('Test text 1., Style: Bold');
+    $this->assertRaw('Test text 1., Bold Test Group: Bold');
 
     // Configure style bold as default.
     $edit = [
       'behavior_plugins[style][settings][groups][]' => ['bold_test_group'],
+    ];
+    $this->drupalPostAjaxForm('admin/structure/paragraphs_type/' . $paragraph->getType(), $edit, 'behavior_plugins[style][settings][groups][]');
+    $edit = [
+      'behavior_plugins[style][settings][groups][]' => ['bold_test_group'],
       'behavior_plugins[style][settings][groups_defaults][bold_test_group][default]' => 'bold',
     ];
-    $this->drupalPostForm('admin/structure/paragraphs_type/' . $paragraph->getType(), $edit, t('Save'));
+    $this->drupalPostForm(NULL, $edit, t('Save'));
 
     // Check that the settings summary does not show the default style.
     $this->drupalGet('node/' . $node->id() . '/edit');
only in patch2:
unchanged:
--- a/modules/paragraphs_collection_demo/paragraphs_collection_demo.install
+++ b/modules/paragraphs_collection_demo/paragraphs_collection_demo.install
@@ -82,7 +82,7 @@ function _paragraphs_collection_demo_add_background_plugin_field() {
     ],
     'style' => [
       'enabled' => TRUE,
-      'group' => '',
+      'groups' => ['general_group'],
     ],
   ]);
   $container->save();
only in patch2:
unchanged:
--- a/paragraphs_collection.install
+++ b/paragraphs_collection.install
@@ -4,6 +4,8 @@
  * Installation hooks for paragraphs collection module.
  */
 
+use Drupal\paragraphs\Entity\ParagraphsType;
+
 /**
  * Add default config for enabled styles.
  */
@@ -13,3 +15,27 @@ function paragraphs_collection_update_8001() {
     ->set('enabled_styles', [])
     ->save();
 }
+
+/**
+ * Update style plugin config of Paragraph types.
+ */
+function paragraphs_collection_update_8002() {
+  $paragraph_types = ParagraphsType::loadMultiple();
+  foreach ($paragraph_types as $id => $paragraph_type) {
+    /** @var ParagraphsType $paragraph_type */
+    if ($paragraph_type->hasEnabledBehaviorPlugin('style')) {
+      $default = '';
+      $group = $paragraph_type->getBehaviorPlugin('style')->getConfiguration()['group'];
+      $default_style = $paragraph_type->getBehaviorPlugin('style')->getConfiguration()['default'];
+      $group_id = \Drupal::service('paragraphs_collection.style_group_discovery')->getGroupId($group);
+      if ($style = \Drupal::service('paragraphs_collection.style_discovery')->getStyle($default_style)) {
+        if (in_array($group_id, $style['groups'])) {
+          $default = $default_style;
+        }
+      }
+      $config = ['groups' => [$group_id => ['default' => $default]]];
+      $paragraph_type->getBehaviorPlugin('style')->setConfiguration($config);
+      $paragraph_type->save();
+    }
+  }
+}
only in patch2:
unchanged:
--- /dev/null
+++ b/style_group_translation_patterns.yml
@@ -0,0 +1,4 @@
+translation_patterns:
+  - matches: '*.style_group.yml'
+    translatable_keys:
+      - label