By default, the Samsung device displays notifications in the form of an icon on the lock screen, but in addition to personalisation, notifications on the lock screen can be completely disabled and later enabled again.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Lock screen
Step 3:  Enable or disable  Notifications
  1. Open the Settings
  2. Tap on Lock screen
  3. Enable or disable Notifications

Samsung Instructions