How to stop screen going off while calling in Lenovo Z2 Plus??

I bought lenovo Z2 plus. while calling, the screen goes off the moment call is dialed. I want to disable this feature. It annoys me when the call is unanswered. As ZUI is almost a copy of MIUI, I searched for the option as MIUI. But it is not there. Can anybody help on this?? 


Please follow the below

Settings>> Advanced settings> Accessibility> 

Turn on  the setting   Power button ends call when cal.

this will turn on your screen and the proximity sensor will work 



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