go to playstore and search secure folder and enable it and do update after this u will able to use this

click 3 dot on top of notification panel and the try button order u may get option

thanx

i am facing this problem in a5 16

if we turn onn flight mode then it do not change in blue it remain in light blue colour and we can't turn off .for turnig off we have hold on flight mode button and then we r able to turn off .The bug has been fix