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User profile for user: j_thompson_mail
j_thompson_mail Author
User level: Level 1
4 points

Screen Shaing as extended display?

I have two iMacs on my desk. They are both Late 2015, Retina 5K, 27 Inch. Both running Catalina v10.15.16.


I'd really like to be able to use one of these iMacs as an extended display / secondary monitor for the other one, extending one desktop across both screens.


I bought a thunderbolt cable but then found out Target Display Mode wasn't supported. I've played around with Screen Sharing but can only seem to mirror one desktop on the other one.


Is there any way to achieve what I'm trying to achieve here?


Thanks in advance for your help.

Posted on Aug 21, 2020 7:33 AM

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User profile for user: Allan Jones
Allan Jones
User level: Level 9
72,428 points

Posted on Aug 21, 2020 10:49 AM

Have you reviewed this support article about screen sharing?:


Share the screen of another Mac - Apple Support


It has been a long time since I used sharing but I recall mirroring being the only option

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Screen Shaing as extended display?

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