If you scroll down to the bottom of the screen, there is a section called "Thread Display Option". In this section change "Sort Threads By" option to "Thread Start Time". Then click on the "Show Threads" button to the right.
Here is a snap shot of the section I am talking about.
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You will have to do this to every section that you go into and every time you open up the section. I have been doing this for a long time and find it useful. Others go to the Archive section, which I have not tried out so I can not compare the two options.
Hope this helps