I hate to say this is how it was in classic but here it goes.
In classic there was a area I believe in the footer section. That when you opened a forum. There was a informational area that stated who can post, who can reply.
Now when you open a forum the only way to know is to try to post or reply nothing happens.
No message to the user that they are not allowed to post or reply. Or who can.
Nice to have would be something to indicate same.
