Scroll down to the "thread overview". There you can see the thread summarized in a tree layout, which makes more sense since asynchronous discussion isn't typic

Scroll down to the "thread overview". There you can see the thread summarized in a tree layout, which makes more sense since asynchronous discussion isn't typically linear. The current message in the tree is highlighted with the indicator "[this message]"; you can see replies branch out below it and parent messages above it.