If we activate the "Do Not Disturb" mode on the Xiaomi smartphone, all sounds, such as incoming messages or system notifications, are muted. Incoming calls with a short busy signal are also rejected. Do Not Disturb, also known as DND (Do Not Disturb), can be activated manually, but also automatically according to a schedule. Even if the mode is activated, we can still allow selected calls, including "From All", "From Contacts Only", "Marked Contacts Only" (Favorites), or none at all.

Note: We can also (de)activate "Do not disturb" via the access bar.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Tap on  Silent/DND
Step 4:  Enable or disable  DND (Do Not Disturb)
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Tap on Silent/DND
  4. Enable or disable DND (Do Not Disturb)

Xiaomi Instructions