What option do you use to view your presentation?

I am not sure what do you mean by "option". If you are referring to the menu buttons, then you would click on "View" then select between options ranging from "Start from Beginning" or "Start from Current Slide".

A faster way of doing this would be by simply pressing the F5 button when in PowerPoint to automatically begin the powerpoint from the start.

Hope this helps and good luck! :)