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How Fn Lock changes function keys and how to toggle it
Fn Lock toggles the function keys between their standard F1–F12 actions and alternate controls, such as media functions. It matters most on compact keyboards, where one row of keys handles more than one task, and its behaviour varies by keyboard.
The Fn key usually switches modes while held, whereas Fn Lock keeps the alternate mode active until toggled again. Look for a dedicated Fn Lock key or a lock icon; common toggle combinations include Fn with Shift or Esc. BIOS settings, often labelled Function Key Mode or Action Key Mode, and some keyboard software can also set the default.
In short
- Fn Lock keeps an alternate function-key mode switched on.
- Fn with Shift or Esc may toggle it.
- BIOS settings or keyboard software can change the default.
Explained simply
Function keys are the row labelled F1 to F12 on many keyboards. Depending on the keyboard, they can also control features such as sound, screen brightness or media playback, which is especially useful on compact keyboards with fewer keys.
The Fn key usually lets you use these extra controls while you hold it down. Fn Lock keeps that mode active, and the way to switch it on or off varies by keyboard; a key marked with a lock symbol or a setting in the computer’s system software may provide a clue.
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Originally published by Engadget as “What is the Fn Lock icon used for and how do you turn it off and on?”.