If you don't, you may have to press the Fn key and then press an "Fn Lock" key to activate it. For example, on the keyboard below, the Fn Lock key appears as a secondary action on the Esc key. To enable it, we'd hold Fn and press the Esc key. To disable it, we'd hold Fn and press Esc again. Why Lock or Unlock Your Windows Function Keys? Use the Fn Key to Lock or Unlock Function Buttons Lock or Unlock the Function Keys With Windows Mobility Center Use Windows BIOS/UEFI to Change the Function Keys' Behavior on Your Laptops or Desktops Step 1: Access BIOS/UEFI in Windows Step 2: Change Function Keys Behavior Step 1. Locate the Function (Fn) key on your keyboard. The most likely location for this key is at the left bottom side next to the Ctrl key. The letters "Fn" will probably be shaded a different color than the rest of the keyboard, a common color being blue. Video of the Day. Step2:-Now turn on your computer and immediately press the f10 key repeatedly to open the BIOS setup dialogue box. Step3:- Now select the configuration section and reach the action keys mode using the arrow down key and press the "Enter" key to open the enable/disable dialogue box. .

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