Outlook messages in my inbox are threaded

My inbox is currently giving me a lot of headaches. I am looking for a way to configure it such that the messages in my inbox are no longer threaded.
One thing that I don’t like is that group messages from the same person is turned into a thread which can be viewed by clicking on a disclosure triangle which is located by the first message in that conversation.
I would be happy to know of some way to deactivate this threading feature.
