With your presentation open, click the Slide Show View button on the View toolbar.
The first slide in your presentation is displayed; press the spacebar to display the next slide.
The next slide is displayed. Press the Esc key at any time to stop the slide show anywhere in the presentation.
INTRODUCTION
Perhaps the best way to test your PowerPoint presentation is to view the presentation onscreen. Your slides appear in vivid color and consume the entire screen (as they would in an actual presentation). You can use the mouse pointer, press the spacebar, or press the Page Up and Page Down keys to advance the slides. Pressing the Esc key returns you to Normal view.
TIP
Keyboard Options
To display the previous slide, press the Backspace key. To display a particular slide, press the number of the specific slide on the keyboard and then press the Enter key. To stop the slide show, press the Esc key.