To enable screen lock on MacOS, you must follow these steps on all user accounts on your workstation:

• Click the Apple icon on the top left of the screen
• Select System Settings
• Select Lock Screen
• Enable "Require password after sleep or screen saver begins"
• Modify the time value to be 15 minutes or less.

Then, choose one of the following:

Option 1: Configure workstation display sleep time. For laptops, ensure that sleep time is configured for both battery and AC power.

• In Lock Screen.
• Modify Turn display off on battery when inactive to be 45 minutes or less
• Modify Turn display off on the power adapter when inactive to 45 minutes or less

Option 2: Enable screensaver:

• In the Lock Screen
• Modify Start Screen Saver when inactive to be 45 minutes or less.

For macOS version 12 and older:

• Click the Apple icon on the top left of the screen
• Select System Preferences

• Select Security and Privacy

• Enable Require password after sleep or screen saver begins.

• Ensure the time value is less than or equal to 15 minutes
• Configure display sleep time for your workstation for both battery power (if you have a laptop) and AC power
• Go back to System Preferences
• Select Battery

• In the left-hand column, select Battery
• Modify Turn display off after such that this value is no more than 45 minutes

• Next, select Power Adapter.
• Modify Turn display off after such that this value is no more than 45 minutes

• Alternatively, enable screensaver by selecting System Preferences
• Select Desktop & Screen Saver

• Modify Start after such that this value is no more than 45 minutes