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Apparently there is NO dark mode for Pocophone F1 yet. But some beta users have reported getting dark mode after updation. There isn't any settings for that in the system though. Not sure why this happens to some and not to everyone. Do you have Google Messages installed? It might be because any of the apps that you have supports dark mode and maybe that's causing it. It's just a speculation, not an actual reason.
That being said, since you have dark mode, enjoy the feature! :D
Yeah it seems.like I'm one of those lucky people
no haven't installed Google messages. All MIUI apps. Phone and messaging apps are dark now. Really love the new features. Sad that others can't get dark mode...