I can 't see who calling on my phone

Hi Friends,
I'm using Moto G4 plus Nougat problem is, If somebody calling to my phone I can't see the person name (means that green color back ground with round slider button is not coming), Phone is lock also the same I can hear only sound, If suppose I need to see calling person I need to go to the notification (top slider) there I can see caller name and from there I'm attending the call. Previously it was working fine
How to fix this?
Please do comments

Thanks in advance
Sooraj J

Have a look in settings... Notifications... Advanced notifications... Show system apps.... Scroll down to "phone" and adjust your settings as required