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However, when if I happen to connect an external monitor or projector while the computer is turned on and press the Fn + F8 key my PowerPoint screen image increases to 400%, which is the maximum, and if I go to presentation mode I can't advance any slides as it goes back to slide one after I press enter.
An understanding of how to use presentation settings in your operating system. This varies from laptop to laptop. It is usually accessible via a function key in combination with Fn, such as Fn+F1 or Fn+F7. One of the function keys on your laptop will have a small label of a monitor.