CAS Single Sign Out not worked in drupal -

I have:

1. Configurable CAS that works correctly
2. The Drupal Cooled CAS module is configured and the CAS sign in to use it correctly.

   But when I click on log out in Doppel, then I just logged off with a druper that was not coming from.

   No special configuration for logging out?

   "Enable CAS Single Sign Out" itemprop = "text">

   CAS Enable logout menus where you manage your menus, use it as your logout menu instead of Drupal.