You can lock your computer by pressing Window + L. It is your responsibility to keep your data safe. Get in the practice of locking your computer when you leave it.
Window + L when you walk away!
- System Preferences > Security & Privacy > General. Check the box next to “Require Password” and set an interval that meets your workflow. If you want the highest level of security, set it to “immediately.”
- To lock your Mac’s screen, simultaneously press the following keys: Control + Shift + Eject. If you have a newer Mac that doesn’t have an optical drive (and thus has no eject key on the keyboard, such as the Retina MacBook Pro), the command is Control + Shift + Power.