presenter display
The presenter display is a set of controls that helps you navigate and deliver your presentation when you rehearse your slideshow or play it on a separate display. For example, you can view or edit your presenter notes, preview the next slide, track the presentation runtime, and more.
To open the presenter display, do one of the following:
If no external display is connected: Tap , then tap Rehearse Slideshow (you may need to swipe up).
The presenter display appears on your device. To change the presenter display layout, tap in the top-right of the screen, then tap a layout.
If an external display is connected: Tap at the top of the screen.
The presentation begins to play on the connected display, and the presenter display appears on your device. To change the presenter display layout, tap in the top-right of the screen, then tap a layout.