I was wondering if subscribers of a forum are notified when the forum itself is hidden. The users though have the ability the right to access the hidden forum and even add new topics etc.
Thanks for your help,
I have the same question.
When a forum is hidden, you can see that no one is listed on the forum subscribers' page (Forum administration > Show/edit current subscribers) :
When you make the forum visible again, the list of subscribers appears :
So the answer is No. When a forum is hidden, there is no notification sent by mail.
(Screenshots made on Moodle 3.1)