You can make all of your displays mirror each other, or extend your workspace with different apps and windows on each display. If you use an external display with your Mac notebook, you can also use closed-display mode.
Although the Mission Control screen appears automatically when necessary, you can also launch it at any time from your MacBook’s Launchpad display, or by pressing the Mission Control/F9 key on your keyboard. From the trackpad, display the Mission Control screen by swiping up with three fingers.
But in the end, Target Display Mode became an Apple-only technology that allowed Mac users to drive an iMac's display from another Mac. Still, it can be quite compelling to see your Mac mini making use of your older 27-inch iMac as a display, or for troubleshooting an iMac having display issues.
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Check your requirements
Check the ports on your Mac to find out whether you need an adapter.
Check how many displays your Mac supports: Choose Apple menu > About This Mac, click Support, then click Specifications. On the webpage that appears, the number of displays your Mac supports appears under Video Support.
Use extended desktop mode
Maximize your workspace with extended desktop mode, which lets you enjoy full-screen apps and windows on each monitor. Then, use Mission Control to organize apps and windows across your displays. If your Dock is on the bottom of your screen, it appears on any of your displays when you move your pointer to the bottom edge of your display.
Turn on extended desktop mode
Make sure that your external display is turned on and connected to your Mac.
Choose Apple menu > System Preferences, then click Displays.
Click the Arrangement tab.
Make sure that the Mirror Displays checkbox isn’t selected.
Arrange your displays or change your primary display
So that you can move apps and windows across your displays in one continuous motion, arrange your displays to match the setup on your desk. You can also change your primary display, which is where your desktop icons and app windows first appear.
Choose Apple menu > System Preferences, then click Displays.
Click the Arrangement tab.
To change the position of a display, drag it to the desired position. A red border appears around the display as it's moved.
To set a different display as the primary display, drag the menu bar to the other display.
Use video mirroring
With video mirroring, all of your displays show the same apps and windows.
Turn on video mirroring
Toggle Display Machine
Make sure that your external display is turned on and connected to your Mac.
Choose Apple menu > System Preferences, click Displays, then click the Arrangement tab.
Make sure that the Mirror Displays checkbox is selected.
Use AirPlay
With Apple TV, you can mirror the entire display of your Mac to your TV, or use your TV as a separate display. To turn on AirPlay, follow these steps:
Make sure that your TV is turned on.
Choose in the menu bar, then choose your Apple TV. If an AirPlay passcode appears on your TV screen, enter the passcode on your Mac.
Mirror your display or use your TV as a separate display:
To mirror your display, choose , then choose Mirror Built-in Display.
To use your TV as a separate display, choose , then choose Use As Separate Display.
To turn off AirPlay, choose , then choose Turn AirPlay Off.
If you don't see in the menu bar, choose Apple menu > System Preferences, click Displays, then select the 'Show mirroring options in the menu bar when available' checkbox.
The Touch Bar of your MacBook Pro changes to show the function keys for you to select, and then it returns to its previous state when you release the Function key.
For some apps, you can make the function keys display permanently in Touch Bar:
In System Preferences, choose Keyboard.
Click Shortcuts.
From the left sidebar, select Function Keys.
Click the “+” symbol, then navigate to the app and select it.
Now when you open or switch to this app, Touch Bar always displays the function keys.
You can also use an on-screen keyboard to access function keys:
From System Preferences, select Keyboard.
Check “Show Keyboard, Emoji and symbol viewers in menu bar”.
Choose the viewer icon in the menu bar, then choose Show Keyboard Viewer.
An on-screen keyboard appears with function keys that you can click.
Using function keys in Windows
Toggle Display Macbook
When you use Boot Camp to run Windows on your MacBook Pro, the function keys work the same as they do in macOS. Hold down the Function key on your keyboard, and the function keys appear.
You can also use the Windows on-screen keyboard to access function keys:
From the Windows menu, select the Windows Ease of Access menu item.
Click On-Screen Keyboard.
Click the fn key. The function keys appear in the on-screen keyboard.
Windows Toggle Display
You can also make the function keys appear continuously in the Touch Bar while using Windows, without having to hold down the Function key:
In the Windows System Tray, click the up arrow to show additional icons.
Click on the dark grey diamond-shaped Boot Camp icon.
Select Boot Camp Control Panel from the menu that appears.
Click Yes to allow the Control Panel to run.
Click the Keyboard tab.
Select 'Use all F1, F2, etc. keys as standard function keys' to make the function keys appear continuously in the Touch Bar all the time. Deselect the checkbox to return the function keys to standard behavior.