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3

The problem with your setup does not have to do with the resolution, as others have hypothesized. The problem is that the dock you're using is not supported on macOS for a 3-display configuration. In practice, the HP Thunderbolt docks require MST-support for multiple displays from the system before they can enable 3 separate displays connected to the dock. ...


1

As shown on Apple's website, there is a restriction on the number of monitors that can be used at the same time. If you want a more specific answer, could you post the resolutions of your monitors. Up to two displays with 5120-by-2880 resolution at 60Hz at over a billion colors. Up to four displays with 4096-by-2304 resolution at 60Hz at millions of colors. ...


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