Quick Access Buttons
It is not necessary to switch to the View ribbon in order to quickly see your slides in a different view.
At the bottom right corner of the PowerPoint screen, you will see the quick access buttons. These handy buttons are the same as in previous versions of PowerPoint. The screen shot above indicates the different buttons and their uses. You can quickly switch to Slide Sorter view, Normal (or Slide) view, or Slide Show view. You can also zoom in or out on the current view, or fit the current slide to the window.