I'm having trouble finding the toggle for having ONLY registered users being able to view the board (i.e. no guests)... can someone point me in the right direction?
Not really - as that defeats the whole power of the user groups in .threads. You can have different settings for each forums.
You choose exactly who can see, reply to, write to or not see each forum. <img src="https://www.ubbcentral.com/boards/images/graemlins/wink.gif" alt="" />