If you activate the "Do not disturb" mode on your Huawei smartphone, all sounds, such as incoming messages or system notifications, are muted. Incoming calls are also rejected with a short busy signal. "Do not disturb" can be activated manually, but also automatically according to a schedule you set. Despite the mode being activated, you can allow selected calls. These include the setting options "All", "Only contacts", "Only favorites" (selected contacts), or none at all.

Note: you can also activate "Do not disturb" over the Quick access toolbar.

Android 10 | EMUI 10.0
Step 1:  Open the  settings
Step 2:  Tap on  Sounds & vibration
Step 3:  Tap on  Do Not Disturb
Step 4:  Activate  Do Not Disturb  or  Scheduled
  1. Open the settings
  2. Tap on Sounds & vibration
  3. Tap on Do Not Disturb
  4. Activate Do Not Disturb or Scheduled

Huawei Instructions