Believe it or not, Android 8.0 Oreo actually debuted with an invisible Do Not Disturb toggle in the volume popup. This DND toggle is enabled through the System UI Tuner, so not everyone saw it. If you knew where the toggle was, it still worked, but this was a bit of a stupid mistake for Google to make in the first place. The Android 8.1 developer preview fixes this problem and adds a DND toggle that we can actually see.

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