What is this option!?

[ᗰOᕼᗩᗰᗰEᗪKᕼᗩTᖇI]

It happens everyday around this time.

It happens when I see a video on YouTube in full screen.

Grey dot before the time.

[RαʝҽʂԋKυɱαɾ21]

WHICH APP ?

[ᗰOᕼᗩᗰᗰEᗪKᕼᗩTᖇI]

I don't know about any app.

[RαʝҽʂԋKυɱαɾ21]

WHERE DOES IT SHOWING?
HOME SCREEN OR OTHER ?

[ᗰOᕼᗩᗰᗰEᗪKᕼᗩTᖇI]

It is in the notification panel. Happens when I do not open it and where you see the time using an app or home screen or app screen before the time displayed

[RαʝҽʂԋKυɱαɾ21]

CLEAR DATA AND CACHE OF CLOCK APP
AND CHECK AGAIN STILL PROBLEM?

[ᗰOᕼᗩᗰᗰEᗪKᕼᗩTᖇI]

The problem is not fixed

[RαʝҽʂԋKυɱαɾ21]

CLEAR CACHE OF ONE UI HOME !

[ᗰOᕼᗩᗰᗰEᗪKᕼᗩTᖇI]

Not working

[ᗰOᕼᗩᗰᗰEᗪKᕼᗩTᖇI]

See, it happens when I open a video in YouTube and full screen it.