Topic is private but I want to be all topics open so google can read them.

If you login you see this topic:

https://www.offirent.be/helpdesk/alle-vragen/verhuurt-u-een-kantoor-in-vlaanderen

But for some strange reason it is set to private. How can I set that all topics (I don't want private topics) are open to read for google but not the answers?

When I try to update the topic not to be private it is still private.

Thank you,

Davy