If a Lock screen has been set up, the Samsung device is locked immediately when the on/off button is pressed. When the display is switched back on directly, the password, PIN or pattern is then requested. If the "Lock automatically" function is used, this function can be switched off to save having to unlock it again.

Note: Depending on the model, the function key is meant instead of the on/off key.

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  Lock instantly with Side key
  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 Lock instantly with Side key

Samsung Instructions
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