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I think he is talking bout plugging or unplugging a new/different display.

You can connect external displays to USB-C or Thunderbolt docks / hubs.

ah I see, I'll add that to the checklist

Worth remembering that you can configure a machine to either mirror a display (I would expect the most common case) or extend the desktop (new display becomes display #2).

It is also not uncommon to dock a laptop at a workstation with dual or triple monitors.

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