Question about marking threads read
 

I kow this is an available setting, but can't seem to find it in the vboptions, lol.

when i am viewing a forum (forumdisplay.php) for a certain amount of time,k the threads in the forum are marked as read, even if i haven't yet opened them to view the latest replies. I only want threads to be marked as read after members open the specific threads.

Can someone please explain where this setting is?

Thanks :)