Introduction
Install and use the third-party tool Display Menu to make controlling secondary displays like projectors easier from a Mac.
This tool is just a shortcut to the full menu of choices that are found in System Preferences / Dipslays. All display settings can still be modified in the default location at any time.
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Open the Self Service app, and find Display Menu.
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Install Display Menu, and then click the Open button to launch it.
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Click the TV-shaped icon on the menu bar to open Display Menu.
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Click on the small down arrow and select Start at Login so the app is always running in the menu bar. Verify it has a check next to it.
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Select Mirror Displays from the drop-down menu.
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Adjust both the built-in display and the attached display or projector quickly.
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Note that both resolutions and aspect ratios are listed (for most options).
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Easy access to System Preferences / Diplays is available in the drop-down menu too.
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