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How to restore the black typing area of mobile phone?

Reset the display settings of the mobile phone.

The typing area of the mobile phone turns black, which may be caused by the setting of the monitor. You can try to reset the display settings of your phone to return to normal. First, enter the phone's setup menu and find the "display" or "screen" option. Then, check whether there are options for font color or theme, and adjust them according to your preference.