Currently, there is only a subtle difference between topics in a forum I have read, and ones that are new.
I do use subscription to get a count of how many new topics there are. When I go to the topic list, it can be very hard to tell which are which. Especially if there is glare on my screen, or my eyes are tired.
I’d love to here I just missed flipping a switch in preferences. If that doesn’t exist, could you forward this request to the forum software vendor please? It will make life easier for those of us with less-than-perfect vision.