Use a Screen Saver
You can have moving images appear on your screen (called a “screen saver”) when you aren’t using your computer. You might want to use a screen saver to hide the items on your desktop while you’re away.
For extra security, you can lock your screen by requiring a password to turn off a screen saver. You can set this type of password in Security & Privacy preferences.
Open the General pane of Security & Privacy preferences
- Choose Apple menu > System Preferences, click Desktop & Screen Saver, and then click Screen Saver.
Open the Screen Saver pane of Desktop & Screen Saver preferences - Select a screen saver from the list.
For extra security, you can lock your screen by requiring a password to turn off a screen saver. You can set this type of password in Security & Privacy preferences.
Open the General pane of Security & Privacy preferences