XF 2.0 How do I hide a forum from search engines

[Spartan]

I have a forum that is hidden to guests, but the threads are still showing up in search results.

 

[whynot]

I have a forum that is hidden to guests, but the threads are still showing up in search results.

Visit your forum without logging in.
Should not be able to see those threads.
Search engines would not be able to see those threads as well.
If they scraped your forum before it was hidden from them then that's why those threads show up now.