Who has bought the Samsung Galaxy J3 smartphone will as first thing have a look into the settings of the device.
Here you now may notice that the Samsung Galaxy J3 has not integrated an option for the Automatic Brightness on the status bar and in the display settings. The Auto Brightness is a useful feature, because the smart phone is using a sensor to adjust the brightness of the display automatically to the lighting conditions.
But unfortunately that is the problem. Because the Samsung Galaxy J3 has unfortunately not integrated such a sensor which measures the ambient light intensity.
Thus, it is of course not possible that the brightness is automatically controlled and what is the explanation for the absence of the option in the Android settings in reverse.
You know now why the Samsung Galaxy J3 has integrated not an option for automatic brightness in the settings.