• Update
  Now that the final Android 6.0 Marshmallow release is out, we can confirm that this new method of accessing the System UI Tuner still works exactly the same as in dev

Initially, upon flashing the third developer preview of Android 6.0, we thought our beloved System UI Tuner had gone the way of the dodo. Not so - it's still here, it's just a little less obvious how to get it.