Smart Lock, Face Detection or even the fingerprint sensor pose a certain security risk, and these unlock methods can be temporarily overridden by an additional button, requiring the entry of the password, pattern or PIN.

The button is displayed on the Samsung device after activation in the power on/off menu.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Lock screen
Step 3:  Tap on  Secure lock settings
Step 4:  Enter your Lock screen  Password / PIN / Pattern
Step 5:  Enable or disable  Show Lockdown option
  1. Open the Settings
  2. Tap on Lock screen
  3. Tap on Secure lock settings
  4. Enter your Lock screen Password/PIN/Pattern
  5. Enable or disable Show Lockdown option

Samsung Instructions
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