Hello Dennis,
it really doesn't make much sense to log out in a SSO environment since the only user you are able to login with at all is your current windows-user. That's why we intentionally disabled the logout button in this scenario.
Anyway if you really need to logout and back in again you can do it in the way you described above. Logout using your URL and navigate to the dashboard again - you will automatically be logged in again.
Regards
Nicolai