Currently, Xiaomi is rolling out the stable MIUI 12 update to more devices in different regions. As the company has already completed the MIUI 12 rollout for the second batch and the third batch devices are lining up for the MIUI 12 update.
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According to the short clip shared on telegram, the power menu has a slider that can be dragged up to restart the device or dragged downwards to shut it down. For MIUI 13, the power menu does not cover the entire screen, but it appears that it still blurs on the screen when it comes up.
For Xiaomi devices those are running on MIUI 12, when you hold down the power button, the power menu covers the whole screen and shows four buttons – Airplane, Silent, Reboot, and Power Off. When the MIUI 13 is announced next year, this redesigned power menu will make it to the final stable.