If you want Fn Lock to remain on or off even after reinstalling Windows, change it in the BIOS:
Do you want your F-keys to act like standard F-keys forever? (For example, if you are a developer or gamer who uses F-keys frequently). You can change this setting deep in the computer's BIOS so it remembers your preference even after a restart. function lock on dell laptop
To enable or disable the Function Lock, follow these steps: If you want Fn Lock to remain on
Note that Fn lock settings on your laptop keyboard usually do not carry over to external USB or Bluetooth keyboards. Which Setting Should You Choose? function lock on dell laptop
Ensure the Fn key itself isn't physically stuck or obstructed by debris.