Bear in mind that our forums are different by design. I earnestly believe that they are more efficient for users than the classic approach of multi-forums.
But one can only really discover this by using them.
Though, some users simply don't like them. And for those users, we have "Classic Mode". Click "Classic Mode" at the top of the forum, and you'll get what I suspect is what you're looking for.
Furthermore, I recommend reading the article
About Our Forums, which describes not only the philosophy that went into their design, but how everything works.