OK, after reading more here, and thinking about what the WATCH prompt actually says, I had the mistaken impression that WATCH had to do with what I see on the main forum list page. But apparently it is only checking whether to send you a notification when something new appears, which is not what I was hoping to see.
I really want to see the same thing we had in the old forum software that let you set in your profile which forums showed NEW and were highlighted on the main page so that I'd know which forum(s) I wanted to look at. I thought that was what Bernie was talking about, too. This is nothing to do with the New Posts box on the right, nor with a New Posts button, just a quick glance showing ONLY the forums I want to keep track of -- Like Bernie "I am not interested in following for sale" and a number of other forums, such as Winnebago, Pets, etc.