Print
  1. Press the Windows key + P. (While holding down the Windows key, press and release the P key.)
    Win-P_Keys
  2. Click on the Display option you would like to use.
    winp_e
    Computer only – This shows your desktop only on your main display screen.
    Duplicate – This shows your desktop on both of your computer display screen(s) and a connected external projector.
    Extend – This extends your desktop from your computer display screen(s) and a connected external projector.
    Projector only – This shows your desktop only on an external projector.

Remarks: PowerPoint 2013 uses Presenter View by default when you project slides onto the projector or dual monitors.  Here are the steps to turn off the Presenter View mode:  How to turn off PowerPoint Presenter Mode?