diff -u b/page_manager_ui/page_manager_ui.module b/page_manager_ui/page_manager_ui.module
--- b/page_manager_ui/page_manager_ui.module
+++ b/page_manager_ui/page_manager_ui.module
@@ -166,8 +166,8 @@
  */
 function page_manager_ui_preprocess_block(&$variables) {
   if (Drupal::theme()->getActiveTheme()->getName() === 'seven') {
-    // If active theme is seven and the block has layout_builder contextual links,
-    // do nothing.
+    // If active theme is seven and the block has layout_builder contextual
+    // links, do nothing.
     if (isset($variables['elements']['#contextual_links']['layout_builder_block'])) {
       return;
     }
diff -u b/src/Plugin/DisplayVariant/LayoutBuilderDisplayVariant.php b/src/Plugin/DisplayVariant/LayoutBuilderDisplayVariant.php
--- b/src/Plugin/DisplayVariant/LayoutBuilderDisplayVariant.php
+++ b/src/Plugin/DisplayVariant/LayoutBuilderDisplayVariant.php
@@ -33,6 +33,9 @@
     return $build;
   }
 
+  /**
+   * {@inheritdoc}
+   */
   public function defaultConfiguration() {
     return parent::defaultConfiguration() + [
       'sections' => [],
diff -u b/src/Plugin/LayoutBuilderStorage/PageManagerLayoutBuilderStorage.php b/src/Plugin/LayoutBuilderStorage/PageManagerLayoutBuilderStorage.php
--- b/src/Plugin/LayoutBuilderStorage/PageManagerLayoutBuilderStorage.php
+++ b/src/Plugin/LayoutBuilderStorage/PageManagerLayoutBuilderStorage.php
@@ -11,7 +11,7 @@
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
- * A Layout Builder storage service that stores Layout Builder displays in Page Manager.
+ * A Page Manager storage service that stores Layout Builder displays.
  */
 class PageManagerLayoutBuilderStorage extends PluginBase implements ContainerFactoryPluginInterface {
 
@@ -58,6 +58,7 @@
    *   The page variant entity's id.
    *
    * @return \Drupal\page_manager\PageVariantInterface
+   *   The variant object.
    *
    * @throws \Exception
    */