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External monitor on 2020 iMac?

How do I connect an external monitor to my new iMAc (Retina 5K, 27" 2020)? My display preferences does not have an "arrangement" tab.

Posted on Sep 5, 2020 11:57 AM

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Posted on Sep 5, 2020 12:43 PM

The "arrangement" tab will appear when iMac detects another monitor. Without connecting to extra monitor, "arrangement" will not show up.


iMac 2020 would use TB 3 for additional monitor. Please refer to the information below, as well the spec of the external monitor for compatibility check.

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Sep 5, 2020 12:43 PM in response to Gruinard

The "arrangement" tab will appear when iMac detects another monitor. Without connecting to extra monitor, "arrangement" will not show up.


iMac 2020 would use TB 3 for additional monitor. Please refer to the information below, as well the spec of the external monitor for compatibility check.

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Sep 5, 2020 1:14 PM in response to samtenor

Thank you, The iMac recognized the monitor when connected to the HDMI cable with the apple USB-C to Digital AV Multiport Adapter. It did not recognize the monitor when I connected the HDMI cable to a third party HDMI to Thunderbolt 2 adapter and then to and apple Thunderbolt 2 to USB-C adapter.

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External monitor on 2020 iMac?

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