Since this behavior is controlled at the hardware level, there is no single "switch" within Windows 11 settings to toggle it off. Instead, you must use keyboard shortcuts, BIOS settings, or manufacturer-specific software. Method 1: Use the Keyboard Shortcut (Fn Lock)
The first article told him to enter the BIOS (Basic Input Output System)—the deep magic of the computer. He restarted his laptop, spamming F2 (while holding Fn, of course). Inside the blue-and-white menu, he found a setting labeled “Action Keys Mode” or “Function Key Behavior.” He switched it from Multimedia to Function Keys . He saved and exited. Success!… for about ten minutes. It worked perfectly, but the BIOS option was hidden three menus deep, and a Windows update later, the setting mysteriously reverted. Too fragile. how to disable fn key windows 11
And from that day on, he never accidentally dimmed his screen during a presentation again. Since this behavior is controlled at the hardware