How to enable Sytem UI Tuner in Android Marshmallow ?

There is a hidden menu in Marshmallow named Syetem UI Tuner which really helps a lot in the new customisation features which require flashing and rooting. It can be enabled by following some simple steps as given below.

=> Open Settings

=>  Tap and hold it for a few seconds 

( It will open a hidden menu in settings )

=> You will recieve a pop-up message saying "Congrats! System UI Tuner has been added to Settings."

=> Now go to the settings

( you will see the new item listed )

=> Open it ( You will get a warning message )

=> Read and understand it , if you are ok with the warning then proceed using it

BATTERY PERCENTAGE ADDED

STATUS BAR OPTIONS ADDED

ADD TILE OPTION ADDED

DEMO MODE ENABLED