Windows 11 supports legacy Control Panel applets, but modern OEMs provide UWP apps:
Here are the methods, ranked from the easiest to the most advanced.
Depending on your goal, "locking" the Fn key can mean two things: lock fn key windows 11
This is the most common combination for toggling the lock on most laptops.
Look for a lock icon (🔒) on a key—usually Esc, Caps, or F12. Windows 11 supports legacy Control Panel applets, but
Select from the dropdown menu to lock them, or "Multimedia key" to use media shortcuts as the default. 3. BIOS/UEFI Settings (Permanent Solution)
Used on certain keyboards, such as the Microsoft Surface All-in-One Media Keyboard . Select from the dropdown menu to lock them,
If you primarily use F5 to refresh, Alt+F4 to close, or Ctrl+F9 in IDEs, lock Fn to function keys . If you adjust volume and brightness constantly, unlock to media keys .
Note: This option appears only if your OEM installed the corresponding control panel driver.