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Depending on the Samsung model, the device is switched off differently; on newer models, the power button is linked to the bixby assistant, which means that the device cannot be turned off using the button.

The Samsung device can be switched off via the status bar, and the power button can also be reactivated if desired.

Android 11 | One UI 3.0
How to Power off Device - Press and hold the  Power button
How to Power off Device - Tap on  Power off
How to Power off Device - Tap again on  Power off
  1. Press and hold the Power button
  2. Tap on Power off
  3. Tap again on Power off

Samsung Instructions