What Is The Fn Lock Icon Used For And How Do You Turn It Off And On?

One key to rule them all.

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Not every keyboard has one, but if yours has a key marked Fn, F Lock or Fn Lock, it might not immediately be clear what it does. Pressing one of these keys alone does nothing. At most, depending on your configuration, it might turn the Fn Lock key indicator on. Even more confusingly, you may have an Fn key and see Fn Lock or a lock icon printed on a different key with no indication of what either does.

The Fn and Fn Lock keys are most often found on laptops, but they appear on some standalone keyboards as well, especially smaller ones, like Logitech's G512 X. They're used with the function keys (the F1 to F12 keys on the top row) to add support for more controls to compact keyboards or, in the case of Mac users, activate Google's...

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