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 newer iMacs featuring Thunderbolt 3 or USB-C ports, a standard USB-C to USB-C cable is required.
How to Use Your iMac as a Monitor for MacBook Pro with This Simple Guide
By doing so, you can run multiple applications side-by-side, review detailed designs, or simply enjoy a more comfortable viewing experience. Once you have the correct cable, the setup process is remarkably simple.
Your MacBook Pro must remain awake and connected for the iMac to function as a monitor. Then, power on the iMac while holding down the Command (⌘) and F2 keys on the keyboard.
How to Use Your iMac as a Monitor for MacBook Pro with Cable Setup
Furthermore, it provides a cost-effective solution to upgrade your display setup without purchasing a new monitor, maximizing the utility of your existing Apple hardware. While the display is off, connect one end of the cable to your MacBook Pro and the other end to the iMac.
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