Win8/10 allow for two separate screens: the internal one, for instance, the tablet screen with which the presenter interacts. And an external one, such as a TV display or a HDMI recording device. At this time, both screens show the same display. For presentation and recording it would be extremely convenient to have neither the UI icons or menus appearing on the second display. The clutter-free second display would be better for the audience. Otherwise, content would be the same.