Some apps require permission to change system settings. if permission is granted, apps on the Samsung device can change all settings that do not affect security, so the app cannot change the lock screen.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Apps
Step 3:  Open the  menu
Step 4:  Tap on  Special access
Step 5:  Tap on  Change system settings
Step 6:  Enable or disable desired  App
  1. Open the Settings
  2. Tap on Apps
  3. Open the menu
  4. Tap on Special access
  5. Tap on Change system settings
  6. Enable or disable desired App

Samsung Instructions
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