If we want to end a call via a key, we can do this with the side key (Power Button) of the Samsung device. To be able to end calls via the side key, the function must first be activated in the phone settings.

Android 10 (One UI 2.0)
Step 1:  Open the  Phone-App
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Answering and ending calls
Step 5:  Enable or disable  Press Side key to end calls
  1. Open the Phone-App
  2. Open the menu
  3. Open the Settings
  4. Tap on Answering and ending calls
  5. Enable or disable Press Side key to end calls

Samsung Instructions
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