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The design of macOS is to detect a show being linked, request its capabilities (learn the EDID on HDMI for instance) after which provision the show. Most shows don’t ship viable alerts out the entire ports to avoid wasting on prices. In your case, that is what causes the final linked Mac to seize the pixels.
Getting a KVM ensures you can cable all of the computer systems one time and they’re going to detect the right exterior show whether or not they’re first or final after which subsequently honor your selection of which sign will get precedence.
Except your particular show enables you to cycle throughout inputs, you will want so as to add {hardware} or change your cabling or change your process to perform your purpose.
For example, I’ve a Mac and a PC that each have Thunderbolt 3 / USB 4 so I exploit a CalDigit factor hub which lets me swap out and in the 2 computer systems to the exterior show without having additional cables. It serves my wants higher than a KVM since I do not thoughts swapping the cable and wish my audio unit, headphones, keyboard and mouse to all change with the show. It additionally permits quick and expansive exterior storage to be prepared for both machine.
Relying on the precise Mac, actual cable selection and actual show there could be one among these choices that’s extra optimum, however there’s not an excellent normal thought software program answer for KVM wants in my expertise. If you cannot get the show to swap enter, you may want to alter a cable whether or not it is a hub, the present cables or getting a KVM that fits your wants.
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