This function you can ONLY get from the quick settings menu, just do a 2-finger swipe down from notification bar to get direct access to it. If it’s not visible directly on it, you need to edit the quick menu: I have a guide on that HERE.
When you have DND on your quick menu, just tap the 3 little dots on it to change the settings on it.
- Add expectations, if you want your family/kids/boss to be able to reach you even though DND mode is active.
- Use Auto turn off and decide a numbers of hours when it will turn off.
- Enable alarms and timers to be played when you have DND mode active.