If you close the MacBook lid, the system will typically go to sleep, breaking the connection unless specific power settings are adjusted. Here, you can choose between "Default for display" for the best resolution or "Scaled" for more layout options.
Set Up Your iMac as a Native Monitor for MacBook Pro
The iMac screen will only display the extended desktop; you cannot use the iMac’s keyboard and mouse to control the MacBook unless you are actively on the iMac display. For older 27-inch iMacs with Thunderbolt 2 ports, you will need a Mini DisplayPort to Mini DisplayPort cable.
The process is straightforward for Mac users, relying on built-in software rather than third-party peripherals. Instead of the iMac receiving a signal, it acts as a display output device, receiving a signal from the MacBook Pro via a direct cable connection.
Set Up Your iMac as a Native Monitor for MacBook Pro
Both the iMac and the MacBook Pro need to be running relatively recent versions of macOS to ensure compatibility. You can then power on your MacBook Pro normally, and the two machines will sync to provide a dual-display experience.
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