Bixby is Samsungs voice assistant and I hated that they put it on the power button. Luckily you can turn it off with a quick settings change.

  • Swipe down from the top to the notifications area.
  • Press the Power menu button in the quick settings panel.
  • Press Side key settings.
  • Change the Press and hold interaction to Power off menu.

That's all that was needed, 

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