for added security, it is recommended that you only allow the face to be unlocked with your eyes open. the feature is usually enabled by default on Samsung devices. if this is not the case or if the feature is not desired, it can be enabled or disabled in the security settings

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Biometrics and security
Step 3:  Tap on  Face recognition
Step 4:  Enter  PIN / Pattern / Password
Step 5:  Enable or disable  Require open eyes
  1. Open the Settings
  2. Tap on Biometrics and security
  3. Tap on Face recognition
  4. Enter PIN/Pattern/Password
  5. Enable or disable Require open eyes

Samsung Instructions
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