Do Not Disturb on Nexus 5X

I get an icon at the top of the screen - both locked and unlocked - when I put the phone into DND.

For Alarm Only and Priority Only it's a white circle with a horizontal line across it - kinda like a no entry sign - and for Total Silence it's a smaller version of this with a white circle around it.

Can't see a setting where I can turn this on or off.

Let's block ads! (Why?)

Do Not Disturb on Nexus 5X