only show instance attribute in menu item selected

app/controllers/settings/menu_item_instances_controller.rb

@@ -154,6 +154,9 @@ class Settings::MenuItemInstancesController < ApplicationController
       else
         @item = MenuItem.find(params[:set_menu_item_id])
       end
+
+      # To Only show in Menu item selected attrs
+      @item.item_attributes = MenuItemAttribute.where(id: @item.item_attributes).select("id, name").map { |e| [e.name, e.id] }      
     end
 
     # Never trust parameters from the scary internet, only allow the white list through.