Issue #3470486: Added new field widget configuration for displaying similar...

Issue #3470486: Added new field widget configuration for displaying similar design for single value select field.

Closes #3470486

config/schema/select2.schema.yml

@@ -5,6 +5,9 @@ field.widget.settings.select2:
     width:
       type: string
       label: 'Field width'
+    single_item_style:
+      type: boolean
+      label: 'Single item style'
 
 field.widget.settings.select2_entity_reference:
   type: field.widget.settings.select2