How to connect my MacBook to IMAC
How to connect my MacBook to IMAC. IMAC will be my screen.
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That setup is no longer supported by Apple. The iMac cannot be used as a monitor for any of the newest Macs and Target Display mode is no longer a feature of macOS, having been deprecated several years ago.
You can find the very specific details of the old feature in this support document:
Please see: Use your iMac as a display with target display mode - Apple Support
Per the link above:
• Your target iMac (monitor) must be using macOS High Sierra 10.13.6 or earlier.
• In all cases the source Mac that you're connecting FROM must have been introduced in 2019 or earlier and have macOS 10.15 Catalina or earlier installed.
However, you might consider a third-party solution, for example: Luna Display or Duet Display.