Function keys F5 and F6 not working properly on macOs when using Keychron keyboard

I'm trying to use the refactoring rename shortcut on IntelliJ (Shift + F6). However, it doesn't work. I'm using macOS and a Keychron K8 keyboard. I noticed that F5 is not recognized either.

How do I get f5 to work on Mac?

Press and hold the Fn (Function) key on your keyboard to see F1 through F12 in the Touch Bar. You can also make the function keys appear automatically when you use specific apps: Choose Apple menu  > System Preferences, then click Keyboard.

What does f5 and f6 do on a Mac keyboard?

To adjust the brightness of the keyboard light on your Mac, use the F5 and F6 keys. You can also set up your keyboard light to automatically turn on when it's dark, and adjust how long it stays on for.

I just found the solution: pressing fn + K + C for 3s, the Keychron keyboard flashes 3 times, then the function of keys f5 and f6 will switch to the normal function on macOS.