[Q] Micromax A 120 Colours notification bar overlapps

[nitu12345]

hello i am using Micromax Canvas A 120 Colour
Whenever i use any launcher like (nova,apex,go...) and open any app (whatsapp ,gmail ,keep...)
the notification bar gets overlapped with app bar making it more brighter white/black in colour
the black background of notification bar
i have provided some screeshots for better understanding

plz tell me how can i solve this
Thankyou