When in Slide Show mode, Powerpoint uses the tool Show Type to determine the type of window that will be used when in Slide Show view. 

Below are the three types of windows: 

• Presented by a speaker (full screen): This is the default option. Slide Show view is full screen and you can click from slide to slide.

• Browsed by an individual (window): If you choose this option, Slide Show view is not full screen. Instead, you get a resizable window. You can click from slide to slide.

• Browsed at a kiosk (full screen): If you choose this option, Slide Show is full screen but you can NOT click from slide to slide. The presentation should be set up to automatic timing so that the viewer doesn’t have to navigate or you can create action buttons or other hyperlinked objects that allow navigation.