Hi @CSAD Praha holding a.s. UAN
There's no Edge policy to configure Edge Dark mode. You can provide feedback to Edge team by pressing Alt+Shift+I in Edge, if you really want to have this feature.
As a workaround, you can set App mode to Dark in Windows. It has a registry key setting like below. But it will change all apps' mode to Dark, you can choose whether to use this setting or not according to your actural situation:
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Regards,
Yu Zhou