I have a Macbook Pro running Mojave 10.14.4 with an external montior, I have set up mirrored display and made the external monitor my primary display.

When I close the lid the monitor goes black, as expected, when I press key to get it to light up again all the applications I opened while the lid was opened are not shown on the external monitor. If I open up the lid the monitors go black and I press a key I can see all applications on both monitors. As I hope to just come in, plug in my Macbook and see what I'm working on in my primary monitor it would be nice if I did not have to open up my secondary monitor to do so.

  • 1
    In mirroring mode, there is no primary or secondary display. Both the displays are identical.
    – Nimesh Neema
    Apr 23, 2019 at 7:48

1 Answer 1


If you have the displays set to mirrored, they should be identical.

When you disconnect the external monitor, the windows must go somewhere, which is to the built-in display. If it’s mirrored, there can’t be a primary display.

  • Ok but what is happening is not that it goes to my built in display when I disconnect the external monitor, or at any rate I don't care if that happens. My problem is that I have windows on my external monitor, I close my laptop, windows no longer on my external monitor. I have tried with external window as primary monitor and I have tried with mirrored monitors, but when I close the laptop the external monitor does not get the opened windows, I can open new windows but I don't have the windows I was working on.
    – user254694
    Apr 23, 2019 at 13:53

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