We can set up a custom schedule for the Xiaomi smartphone's No Disturbance mode by specifying the start and end times, determining the days of the week, and setting whether the device should activate Silent or No Disturbance mode. We can also add a custom name for the created schedule.

Note: The created schedule will remain saved and can be enabled and disabled at will.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Tap on  Silent/DND
Step 4:  Tap on  Schedule turn on time
Step 5:  Tap on  Add
Step 6:  Tap on  Name
Step 7:  Enter a  name  and tap  OK
Step 8:  Tap on  Day of the week
Step 9:  Choose  Every day ,  Weeknights ,  Weekend  or  Custom
Step 10:  Tap on  From / To  to set the start and end time
Step 11:  Tap on  Save
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Tap on Silent/DND
  4. Tap on Schedule turn on time
  5. Tap on Add
  6. Tap on Name
  7. Enter a name and tap OK
  8. Tap on Day of the week
  9. Choose Every day, Weeknights, Weekend or Custom
  10. Tap on From / To to set the start and end time
  11. Tap on Save

Xiaomi Instructions