diff -u b/core/modules/content_translation/config/schema/content_translation.settings.schema.yml b/core/modules/content_translation/config/schema/content_translation.settings.schema.yml
--- b/core/modules/content_translation/config/schema/content_translation.settings.schema.yml
+++ b/core/modules/content_translation/config/schema/content_translation.settings.schema.yml
@@ -3,30 +3,35 @@
-#content_translation.settings:
-#  type: sequence
-#  label: 'Entity type'
-#  sequence:
-#    - type: sequence
-#      label: 'Bundle'
-#      sequence:
-#        - type: mapping
-#          label: 'Content translation settings'
-#          mapping:
-#            content_translation:
-#              type: mapping
-#              mapping:
-#                enabled:
-#                  type: boolean
-#                  label: 'Content translation status'
-#                fields:
-#                  type: sequence
-#                  sequence:
-#                    - type: boolean
-#                      label: 'Per field content translation'
-#            translation_sync:
-#              type: sequence
-#              label: 'Field translation synchronisation settings'
-#              sequence:
-#                - type: sequence
-#                  label: 'Field'
-#                  sequence:
-#                    - type: string
-#                      label: 'Column'
+content_translation.settings:
+  type: mapping
+  label: Entities
+  mapping:
+    entities:
+      type: sequence
+      label: 'Entity type'
+      sequence:
+        - type: sequence
+          label: 'Bundle'
+          sequence:
+            - type: mapping
+              label: 'Content translation settings'
+              mapping:
+                content_translation:
+                  label: 'Content translation settings'
+                  type: mapping
+                  mapping:
+                    enabled:
+                      type: boolean
+                      label: 'Content translation status'
+                    fields:
+                      type: sequence
+                      sequence:
+                        - type: boolean
+                          label: 'Per field content translation'
+                translation_sync:
+                  type: sequence
+                  label: 'Field translation synchronisation settings'
+                  sequence:
+                    - type: sequence
+                      label: 'Field'
+                      sequence:
+                        - type: string
+                          label: 'Column'
diff -u b/core/modules/content_translation/content_translation.module b/core/modules/content_translation/content_translation.module
--- b/core/modules/content_translation/content_translation.module
+++ b/core/modules/content_translation/content_translation.module
@@ -148,7 +148,7 @@
  * Implements hook_entity_base_field_info_alter().
  */
 function content_translation_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) {
-  $translation_settings = \Drupal::config('content_translation.settings')->get($entity_type->id());
+  $translation_settings = \Drupal::config('content_translation.settings')->get('entities.' . $entity_type->id());
 
   if ($translation_settings) {
     // Currently field translatability is defined per-field but we may want to
@@ -273,7 +273,7 @@
 function content_translation_get_config_key($entity_type, $bundle, $setting) {
   $entity_type = preg_replace('/[^0-9a-zA-Z_]/', "_", $entity_type);
   $bundle = preg_replace('/[^0-9a-zA-Z_]/', "_", $bundle);
-  return $entity_type . '.' . $bundle . '.content_translation.' . $setting;
+  return 'entities.' . $entity_type . '.' . $bundle . '.content_translation.' . $setting;
 }
 
 /**
@@ -362,7 +362,7 @@
   $entity_type = preg_replace('/[^0-9a-zA-Z_]/', "_", $field->getTargetEntityTypeId());
   $bundle = preg_replace('/[^0-9a-zA-Z_]/', "_", $field->targetBundle());
   $field_name =  preg_replace('/[^0-9a-zA-Z_]/', "_", $field->getField()->getName());
-  return $entity_type . '.' . $bundle . '.translation_sync.' . $field_name;
+  return 'entities.' . $entity_type . '.' . $bundle . '.translation_sync.' . $field_name;
 }
 
 /**
diff -u b/core/modules/content_translation/lib/Drupal/content_translation/FieldTranslationSynchronizer.php b/core/modules/content_translation/lib/Drupal/content_translation/FieldTranslationSynchronizer.php
--- b/core/modules/content_translation/lib/Drupal/content_translation/FieldTranslationSynchronizer.php
+++ b/core/modules/content_translation/lib/Drupal/content_translation/FieldTranslationSynchronizer.php
@@ -61,7 +61,7 @@
 
       // Sync if the field is translatable, not empty, and the synchronization
       // setting is enabled.
-      $key = $entity->getEntityTypeId() . '.' . $entity->bundle() . '.translation_sync.' .  $field_name;
+      $key = 'entities.' . $entity->getEntityTypeId() . '.' . $entity->bundle() . '.translation_sync.' .  $field_name;
       if ($field_definition->isTranslatable() && !$items->isEmpty() && $translation_sync = \Drupal::config('content_translation.settings')->get($key)) {
         // Retrieve all the untranslatable column groups and merge them into
         // single list.
diff -u b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationSyncImageTest.php b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationSyncImageTest.php
--- b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationSyncImageTest.php
+++ b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationSyncImageTest.php
@@ -81,7 +81,7 @@
         ),
       ),
     );
-    $key = $this->entityTypeId . '.' . $this->entityTypeId;
+    $key = 'entities.' . $this->entityTypeId . '.' . $this->entityTypeId;
     \Drupal::config('content_translation.settings')->set($key, $settings)->save();
 
     // Enable content translation for the 'alt' and 'title' properties on the