Do not disturb mode:
"Allow these people to make phone calls" in the Do-Not-Disturb mode: It is aimed at people or groups who are set not to mute their calls and avoid those strange calls. Anyone, everyone and individuals can choose. And all the contacts, family members and other groups.
Click "Settings", "Notification" and "Do Not Disturb Mode" in turn, and you can set relevant Do Not Disturb mode options according to your personal habit of setting the Do Not Disturb mode.