ThinkPad l440 FN key settings

I just started ThinkPad l440. It's quite good to use. Hey, hey!

The l440 system default (F1-F12) keyboard is the system default function key, mainly controls the volume, brightness, connection projector and so on.

Because programming requires debugging, frequent use of F10, F11 and other keys, but by default these keys are system function keys, to press FN + (F1-F12) key can be achieved (F1-F12) function, it is quite troublesome to use.

I have read many posts on the internet, saying that I want to enter BIOS settings and so on, which is troublesome. I accidentally found that l440 can be switched by myself, directly press FN + ESC to switch between the two modes (fnlk is in the lower right corner of the ESC button), which is quite practical.

When switching, FN key there is a small yellow light can be two modes but don't, when the light is not on (F1-F12) for volume control and other function keys.