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Beyond the touchscreen, the Samsung Galaxy S4 has a physical home button and two touch
buttons that illuminate when the device is being used.
On the left is the context menu button and on the right is the back button. You can change
the settings so that stay illuminated for longer or shorter periods and here's how to
do it.
First of all, go to the settings screen, then choose the my device tab at the top of the
screen and next select display. In this screen you have to scroll to the bottom where you
will find a more settings area and the option you want is Touch key light duration.
There are four options to choose from. So, for example, if I choose 1.5 seconds the buttons
will disappear very quickly like that. The three alternative options are 6 seconds light
duration; always off which means the buttons are never illuminated; and always on which
means the buttons are always illuminated when the touch screen is on. So this example I
have chosen 6 seconds which is my preferred choice.
But you can choose whether option you like to suit your preferences.