Do Not Disturb mode will appear on the scheduled time. For example, if you go to bed at 9 o'clock and you don't want to be disturbed until 8 in the morning, You would tap the box with the times to adjust it
For example, Favorites. You can go to your contacts and mark specific contacts as favorites. You can also set No-One and Everyone, which would be kind of silly. I will leave it on Favorites and go back.
Now we have the repeated calls option, I'm going to turn it on
When enabled, a second call from the same person within three minutes will not be silenced. Basically, when you turn this mode on and someone calls you, it will not notify you. If they call again within 3 minutes, you will be notified. This is usually for emergencies.