I see that this question is asked over and over again.
I made a point to use Stack Exchange rather than Facebook or Gmail to login, as I recently had to do some major annoying stuff to keep Spotify while considering to shut down my Facebook.
I want to be able to logout of Stack Exchange and Stack Overflow by clicking logout. And I want this to force the next login to actually ask for a password.
I want to know what to do rather than why this happens and understanding the details of OpenID. I have tried both doing a logout from StackOverflow.com and also StackExchange.com and it will always let me log back in without asking the username or password, unless I delete the cookies. I understand that other similar questions say that this is not a bug, so I just need a clear way to do it, as looking at other posts considered "duplicate" link to another question that's either not clear or is 2011 or older.