People App - How to turn off history or clear + history inconsistency

I would like to be able to either turn off and / or clear the history pane that appears on the right side of each contact in the People App. I've searched and searched and cannot find any way to accomplish this. I must be missing something simple? Surely there are times when most of us would like to delete or clear the history.

Also, I notice that some of my contacts show something in the history pane, while others with whom I've had recent contact do not. Has anyone else noticed this? Is it a bug? My wife's computer shows history going back weeks, while mine only appears to have history of a day or two. Another inconsistency. Why?

Thanks.

I've noticed the same problem. My People app history consisted of emails that were sent using my oultook.com account. I found that deleting the sent emails from the Outlook.com SENT folder also eliminated the emails showing up in the People App history. Not an ideal way to clear the history, but it works. Hope this helps.