Why does the screen turn off whenever making a call on the Xiaomi Redmi Note 4G?

Hello everyone,i m using xiomi redmi note 4g,whenever i m making a call from any of the messengers whther its whtsapp or fb the screen goes blank or u can say it gets off....plz help as i m totally frustated with the issue....hope to get the answer soon?

Hi there. This is to avoid you from accidentally ending calls or randomly touching anything on the screen while on a call. Simply press power button to open the screen again if you need something.

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