On the LG smartphone, apps can be granted permission to change system settings, but this only affects superficial settings such as ring tone, backgrounds, etc.

Despite activating this function, the app has no access to the display lock or data protection settings.

For more in-depth setting options, the app must be defined as a device administrator.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Apps & notifications
Step 4:  Tap on  Special access
Step 5:  Tap on  Modify system settings
Step 6:  Tap on desired  App
Step 7:  Enable or Disable  Allow write system settings
  1. Open the Settings
  2. Tap on General
  3. Tap on Apps & notifications
  4. Tap on Special access
  5. Tap on Modify system settings
  6. Tap on desired App
  7. Enable or Disable Allow write system settings

LG Instructions
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