Windows
On Windows, you can use the keyboard shortcut
Computer/PC screen only - The second screen is ignored and only the PC’s primary display is used.
Duplicate - The second screen mirrors the primary display.
Extend - The PC display is extended across all screens.
Projector/Second screen only - The main PC display will be disabled and only the secondary screen is used.
Below are screenshots of what the display picker looks like on Windows 7 and Windows 10.

Windows 7

Windows 10
Macintosh
On Macintosh, you can use the keyboard shortcut Command + F1, depicted below, to mirror your displays. To configure more advanced multiple-display options, consult this Apple support article.
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