Typically, you can quickly switch between several different view states (Normal View, Slide Sorter View, Slide Show) using the View button in the lower left corner of the screen.
But you may not know that using the keyboard in conjunction with the view buttons can achieve completely different effects.
For example, when you click the “Normal View” button, if you press the Shift key, you can switch to the “Slide Master View”, and click the “Normal View” button again (without pressing the Shift key) to switch back.
If you click the Slide Sorter View button, you can switch to the Handout Master View by pressing the Shift key.
Additionally, you can have PowerPoint display thumbnails of the slides in the upper-left corner of the screen, so you can preview the results while editing.
To achieve this effect, go to “Normal View” and select the first slide you want to show.
Hold down the Ctrl key and click the Slide Show button. Slide thumbnails can be clicked to switch slides, just like a full-screen slideshow.
For more options, hold down Ctrl+Shift and then press the various view buttons: Ctrl+Shift+Normal View button closes the marked area and notes page on the left and expands the slideshow to the available space.
Ctrl+Shift+Slide Sorter View button displays the presentation in outline mode; Ctrl+Shift+Slide Show button opens a Set Show As dialog box.