I had the same question. Someone was nice enough to answer and it works like a charm.
Please refer to the previously answered inquiry at...http://www.question2answer.org/qa/26289/how-can-i-hide-all-info-when-users-are-not-authenticated
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.