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Cannot set "Use as" to extended display with 2 imacs

I am attempting to extend one 27 inch late 2015 imac to another. I got them to connect and the mouse moves between them, but currently both displays are set to "Main display". I want one of them to extend to the other, so I went into settings and changed the Use as to Extended display. The screen faded black for a second and turned back on, and nothing had changed.


[Edited by Moderator]

iMac 27″, macOS 12.6

Posted on Sep 22, 2023 3:42 PM

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2 replies

Sep 22, 2023 9:01 PM in response to vay177

The Late 2015 iMac cannot serve as a Target Display Mode display for another Mac.


Use your iMac as a display with target display mode - Apple Support


I also don't see the Late 2015 iMac on the "works best with" list for AirPlay to Mac.


System requirements for Continuity features on Apple devices - Apple Support


So how are you trying to display content from one Mac on the other's screen?

Cannot set "Use as" to extended display with 2 imacs

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