I would like to lock my OSX screen at any time, irrespective of whether "Immediately" is configured in the general tab in Security & Privacy settings.
Is this possible?
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The Keychain Access App is located in the Utilities subfolder of the Applications folder.
In the Keychain Access App, open Preferences and under the General tab you can tick the box Show Keychain status in menu bar. It'll put a padlock symbol that's resident in your menu bar that when clicked will provide you with a menu, the first menu item is Lock Screen. After setting the preference you can exit the Keychain Access App.
You can select the menu item to lock your screen.
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.
In both cases, you’ll see your Mac’s display shut off immediately, while the system continues to run in the background.