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
End a Call using Power Button -  Open the  Phone -App
End a Call using Power Button -  Open the  Menu
End a Call using Power Button -  Tap on  Call settings
End a Call using Power Button -  Tap on  Answer and end calls
End a Call using Power Button -  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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