diff --git a/core/lib/Drupal/Core/Entity/EntityDisplayModeBase.php b/core/lib/Drupal/Core/Entity/EntityDisplayModeBase.php
index 01fefaf..b141660 100644
--- a/core/lib/Drupal/Core/Entity/EntityDisplayModeBase.php
+++ b/core/lib/Drupal/Core/Entity/EntityDisplayModeBase.php
@@ -11,7 +11,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * Base class for config entity types that hold settings for form and view modes.
+ * Base class for config entity types with settings for form and view modes.
  */
 abstract class EntityDisplayModeBase extends ConfigEntityBase implements EntityDisplayModeInterface {
 
@@ -20,14 +20,14 @@
    *
    * @var string
    */
-  public $id;
+  protected $id;
 
   /**
    * The human-readable name of the form or view mode.
    *
    * @var string
    */
-  public $label;
+  protected $label;
 
   /**
    * The entity type this form or view mode is used for.
@@ -37,7 +37,7 @@
    *
    * @var string
    */
-  public $targetEntityType;
+  protected $targetEntityType;
 
   /**
    * Whether or not this form or view mode has custom settings by default.
@@ -56,7 +56,7 @@
    *
    * @var bool
    */
-  public $cache = TRUE;
+  protected $cache = TRUE;
 
   /**
    * {@inheritdoc}