Update to Drupal 8.0.0-rc3. For more information, see https://www.drupal.org/node/2608078

core/modules/views/config/schema/views.display.schema.yml

@@ -43,6 +43,9 @@ views.display.page:
         context:
           type: string
           label: 'Context'
+        expanded:
+          type: boolean
+          label: 'Expanded'
     tab_options:
       type: mapping
       label: 'Tab options'

core/modules/views/config/schema/views.sort.schema.yml

@@ -30,6 +30,10 @@ views.sort.standard:
 
 # Schema for the views sort expose.
 
+views.sort_expose.*:
+  type: views_sort_expose
+  label: 'Fallback sort expose settings'
+
 views.sort_expose.boolean:
   type: views_sort_expose
   label: 'Boolean sort expose settings'