The
read topics (and forums) are highlighted like this
The topics with new posts since last visit (and forums containing them) are highlighted like this
So if I'm not interested in some topics I just press
Mark topics as read before 'leaving' the forum.
That's how it works for me at least. If you'd have all topics being marked as
read by default the moment you log-in then the whole idea of
/
differentiation becomes pointless.