how to setup dual monitors in mac?
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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.
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To connect two monitors, simply plug each of them into the Mini DisplayPort on the Dock with a DisplayPort to Mini DisplayPort cable. Once connected, choose what to display on each screen by opening the Action Center and tapping the Project tab to bring up monitor options.
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['Two cables into one monitor. Most monitors have multiple input ports in the back. You can connect both computers to your monitor at the same time using different cables. ... ', 'Hardware KVM switch. Another option is to use a hardware device called a KVM switch. ... ', 'Remote desktop. Remote desktop connections are also an option.']
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['Right-click on the Desktop and select Screen Resolution.', 'Change the Multiple Displays drop-down as per your preference.', 'Select the desired monitor and adjust the resolution using the slider.', 'Click Apply.']
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['Right-click the desktop background.', 'Choose the Display Settings command. ... ', 'Choose an option from the Multiple Displays menu.', 'Click the Apply button to temporarily confirm the monitor configuration.', 'Click the Keep Changes button to lock in any changes.']
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['Insert the Mini DisplayPort plug on the adapter into the Mini DisplayPort or Thunderbolt port on your MacBook. ... ', 'Insert one end of the HDMI cable into the port on your adapter.']
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Click on Display. Under the "Select and rearrange displays" section, select the monitor that you want to adjust. Under the "Multiple displays" section, use the drop-down menu to set the appropriate viewing mode: Duplicate desktop — Shows the same desktop on both displays.
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At the top of the display settings menu, there is a visual display of your dual-monitor setup, with one display designated "1" and the other labeled "2." Click and drag the monitor on the right to the left of the second monitor (or vice versa) to switch the order.
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["Determine your second monitor's connectors.", 'Determine which ports your iMac has.', 'Buy an adapter (if needed).', 'Connect the new monitor.', 'Choose your display settings.']
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['Right-click anywhere on the desktop, and then click Display settings (Windows 10) or Screen Resolution (Windows 8).', 'Make sure the correct number of monitors displays. ... ', 'Scroll down to Multiple displays, if necessary, click the drop-down menu, and then select a display option.']
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['Download and install Apowermirror on your Windows computer. Download. ... ', 'On your Mac, click “system preferences” then “display” from the Apple menu bar.', 'Next, choose “Airplay Display” and wait until the name of your PC appears. ... ', 'From there the mirroring will proceed.']
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Turn on video mirroring 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.
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['Right-click an empty area on your desktop, and then click Screen Resolution.', 'Click the Multiple Displays drop-down list, and then select Extend These Displays or Duplicate These Displays.']
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['Turn off the HDMI device while your Mac is turned on.', 'Unplug the HDMI cable from your Mac, then plug it in again.', 'Turn on the HDMI device.']
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['Plug the cable of the first external monitor to the correct video port on your laptop. ... ', 'Plug the cable of the second external monitor to the other correct port on your laptop. ... ', 'On your laptop, right-click an empty area of your desktop:']
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['Open Settings.', 'Click on System.', 'Click on Display.', 'Under the "Select and rearrange displays" section, select the monitor that you want to adjust.', 'Under the "Multiple displays" section, use the drop-down menu to set the appropriate viewing mode:']
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The 27-inch iMac has a bi-directional Mini DisplayPort or a Thunderbolt port (depending on the model) that can be used to drive a second monitor. The same Mini DisplayPort or Thunderbolt port can be used as a video input that allows your iMac to serve as a monitor for another Mac.