An ongoing call on the LG smartphone can be ended by pressing the on/off key, which still needs to be activated in the settings.

Android 9 | LG UX 9.0
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Call settings
Step 4:  Tap on  Answer and end calls
Step 5:  Enable or Disable  End call with the Power key
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Call settings
  4. Tap on Answer and end calls
  5. Enable or Disable End call with the Power key

LG Instructions
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