if the "do not disturb" mode is activated, notifications are displayed optically, not acoustically (except exceptions) by default. the settings of the "do not disturb" mode allow you to partially or completely switch off the notifications on your Samsung device. if notifications are hidden in "do not disturb" mode, they will be displayed afterwards as soon as the mode is switched off.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Notifications
Step 3:  Tap on  Do not disturb
Step 4:  Tap on  Hide notifications
Step 5:  Enable or disable desired  Notifications
  1. Open the Settings
  2. Tap on Notifications
  3. Tap on Do not disturb
  4. Tap on Hide notifications
  5. Enable or disable desired Notifications

Samsung Instructions
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