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I tried that but the only choices are Linear - Oldest First and Linear - Newest first. If there is any way to easily add a choice to view in thread mode I would appreciate it.
Threaded Mode - a tree is shown along with every post. This shows you the relationship each post has to the others. It's easy to see who responded to whom. Only one post is shown at a time. By clicking on a single post in the post tree, the page will show that post and all posts made in response to it.