The "Do Not Disturb" mode has two different modes on the LG unit:

Only with priority

This will mute the LG device, except for priorities and the alarm clock.

Completely Silent

When this mode is selected, the device is completely muted, and in this mode, the LG device will not hear any alarm or exceptions.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound
Step 3:  Tap on  Do not disturb
Step 4:  Tap on  Mode
Step 5:  Choose between  Priority only  and  Total silence
  1. Open the Settings
  2. Tap on Sound
  3. Tap on Do not disturb
  4. Tap on Mode
  5. Choose between Priority only and Total silence

LG Instructions
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