To read up on the System UI Tuner, be sure to check this post of ours. You can also long-press on the Settings icon again for 5 seconds. To turn it back off, tap the action overflow menu from within the System UI Tuner section and choose to turn it off. We can also programmatically control this element from the shell or another application. With it enabled, you can then tweak your quick toggle tiles, add or remove items from the status bar, and even enter Demo Mode. Android M includes a System UI Tuner developer option to control aspects of the status bar. Once you let go, you should see a pop-up with the message “Congrats! System UI Tuner has been added to Settings.” And as that message suggests, you can head into settings, scroll to the bottom, and find an option for System UI Tuner. To enable System UI Tuner in Android 6.0 Marshmallow preview 3, pull down your notification shade and long-press on the Settings gear icon for up to 5 seconds. In fact, Google has completely hidden the setting unless you perform a secret action to enable it. The System UI Tuner that was first introduced in Android M’s preview 1 and 2 is back again in Android 6.0’s preview 3, only it’s not as easy to find as it once was.

System ui tuner android m