This policy setting specifies whether PowerPoint automatically extends the display when users present on a laptop or tablet ...

This policy setting specifies whether PowerPoint automatically extends the display when users present on a laptop or tablet computer.If you enable this policy setting, PowerPoint does not automatically extend the display when users present on a laptop or tablet computer. In addition, the "Automatically extend display when presenting on a laptop or tablet" checkbox on the user interface (UI) under File | Options | Advanced | Display  is unchecked.If you disable or do not configure this policy setting, PowerPoint automatically extends the display when users present on a laptop or tablet computer. Users can change this behavior by unchecking the "Automatically extend display when presenting on a laptop or tablet" checkbox on the UI under File | Options | Advanced | Display