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I don't believe there is a shortcut key for this, unfortunately, and unlike Excel and Word, PowerPoint doesn't allow us to assign hotkeys to ribbon commands. If any hotkey is already assigned, it should appear as a tooltip when you press and hold ALT (in Windows versions; Option, probably, on Mac).
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There is no shortcut for this, but the easiest way would be to use Windows key+P and then extend your screen. When you start a presentation using F5, PowerPoint should show the presenter view on the PC screen and the slide show on the secondary screen (projector) by default.