Function key lock on Windows 10: Fn key lock [Full guide]

Matthew Adams
by Matthew Adams
Windows & Software Expert
Affiliate Disclosure

  • Many keyboards include Fn keys uses can press to trigger secondary multimedia functions for keys.
  • This guide tells you how you can enable Fn lock, configure the Fn key’s behavior, and disable it on Windows 10 PCs.
  • Find out more about the Function key by exploring our thorough webpage on the subject.
  • You check out our System Setting page to browse through troubleshooting and guide articles more specifically for Windows 10.
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A multitude of keyboards include Function keys. That key is typically positioned at the bottom left of keyboards between the Ctrl and Windows keys.

The Function key enables users to trigger secondary functions for the F1-F12 row keys and others with color symbols on them.

How can I utilize the Function key on a Windows 10 PC?

1. How do I enable Function lock on Windows 10?

Fn key function key lock windows 10

Have a good look for the Fn key on your keyboard, which is usually at the bottom left of your keyboard. If you really can’t see it, maybe your keyboard doesn’t have one. However, most keyboards do have Fn keys for activating secondary key functions, such as volume controls on arrow keys.

When you’ve located Fn, press and hold that key. Then press one of the F1-F12 keys with a color symbol on it to activate its function. For example, pressing the Fn key and an F8 key with a mute icon on it will mute the sound.

You can also active secondary multimedia functions for other keys with blue or green symbols on them. So, try pressing Fn simultaneously with any key that includes a blue or green function symbol it.


2. How do I lock and unlock the Function key?

F3-F5 keys function key lock windows 10

Some keyboards enable users to lock the Fn key so they don’t have to always press Fn to active secondary key functions. So, you might be able to press an Fn lock key on your keyboard. Look for a keyboard key with an Fn padlock icon on it.

Esc is an Fn padlock key on many keyboards. If you see an Fn padlock on your Esc key, press and hold the Fn key. Then press Esc while holding the Fn key. Thereafter, you won’t need to press the Fn key to active secondary key functions. To unlock Fn, press and hold Fn and the Esc key again.


3. How do I turn off (disable) Function lock on Windows 10?

  1. To disable the Fn key on Windows 10 PCs, click the Type here to search taskbar button.
  2. Then enter advanced startup in the search box.
  3. Click Changed advanced startup options to open the window shown directly below.
    the Restart now button function key lock windows 10
  4. Click the Restart now button for advanced startup
  5. When your desktop or laptop restarts at the blue Advanced Boot Options menu, select Troubleshoot and Advanced Options.
  6. Then select UEFI Firmware Settings and Restart to enter the BIOS settings.
  7. Thereafter, look for an Action Key Mode setting on the System Configuration or other tabs.
  8. Disable the Action Key Mode setting.

Note: Users with older laptops and Windows platforms will need to enter the BIOS by pressing one of the F1-F12 keys during system startup. Check your PC’s manual, or its manufacturer’s website, to find what the BIOS key is for your PC.


4. How can I change the Function key’s behavior?

  1. To configure the Fn key functionality, enter your PC’s BIOS settings as outlined directly above for disabling Fn.
    The BIOS function key lock windows 10
  2. Select the Advanced tab in BIOS.
  3. Then select the Function Key Behavior option there.
  4. Select Multimedia Key or Function Key depending on preference.

Note: Users with Dell laptops can adjust that same setting from the Windows Mobility Center.

So, that’s how you can utilize the Fn key, modify its behavior, and disable it if you prefer to. Overall, Fn is an important key that provides numerous handy keyboard shortcuts for users.

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