I just found out about nodebb and found that also very confusing.
After a while I realised I had to click on "posted", but it's very counterintuitive.
Would allow for adding a larger search bar in the global widget header, which would suit those wanting to display their forum in a stack overflow style manner. After 0.5.0 though, naturally.
Sidenote, the ability to not index certain forums in the search would be tip top, do a search for mobile, the top 3 posts are from Testing Forum, does apache solr have any weighting behind it to guage the useful topics from the not so useful?