How turn off External Display, on closing lid in Kubuntu 20.04 or KDE

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I'll running Kubuntu 20.04 on a laptop using both the laptop screen and a rather recent external monitor (Iiyama PL2796QS) connected with HDMI.

I would like to have the external monitor turned off when I close the lid of the laptop. I have searched the power management options but the external monitor isn't considered.

I have seen this question but this is for a Gnome desktop. My own dconf has very little to show...

Any ideas?


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