You can't as of the Anniversary update [1]. You can kind of hide it though. [1]: http://www.cnet.com/how-to/cortana-is-mandatory-in-the-windows-10-anniversary-

You can't as of the Anniversary update [1]. You can kind of hide it though. [1]: http://www.cnet.com/how-to/cortana-is-mandatory-in-the-windows-10-anniversary-update/ http://www.cnet.com/how-to/cortana-is-mandatory-in-the-windo...