That little slide show view really works, too. You can click on it to advance the slides, and press Esc to close it.
You won’t believe how easy it is to do this. Just press the Alt key as you click the Slide Show view icon 
That’s all there is to it! Then you can see both views at the same time.
Unfortunately, you can’t move the little Slide Show view and it does hide a good part of your working area, but it’s just a window, so as soon as you need to work in Normal view, click in that view and your Slide Show view disappears so that you can work.
But it isn’t gone; you’ve just minimized it and you can display it on top again by clicking its button on the Windows taskbar.
Even cooler, if you have a wide screen, you can make your Normal view window narrower and display both windows side by side. Then you have your cake and eat it too, easily going back and forth between the two views.
So, next time you want to check something in Slide Show view, instead of pressing F5 or Shift-F5 (which starts Slide Show view at the current slide), or clicking the Slide Show icon, press Ctrl and use that quarter-size view.
Ellen, this is the absolute BEST time-saving tip I have ever heard for PPT!! You have just shaved hours (days?) off my workload if you add up all those minutes over the course of a year I’ve spent switching between views. Brilliant!