Samsung U28E590D 28-Inch 4K Monitor
The process is rather simple and involves only a few quick steps. First, swipe down on the notification panel to bring up the Quick Settings menu. From there, long press on the Settings icon until a notification appears and takes you to the Settings menu. The control panel is then located at the bottom.
Choose the option named “Quick Settings” at the top and from there you can enable and disable various tiles on and off. Status icons can also be toggled. In this same menu, there’s a checkbox that allows you to enable battery percentage. This option is marked “show embedded battery percentage,” which shows your remaining battery life in the status bar.
To get back to the UI Tuner, use the Quick Menu. You should now have a wrench icon hovering next to it to indicate that the UI Tuner has been enabled.
You can read our full breakdown of the new features in Android 6.0 Marshmallow here.