How to rebind the mob light level indicator toggle key?

I'm using the NotEnoughItems (NEI) mod and I know if I press F7 there should be a grid where monsters will spawn. But when I press it, nothing happens, it was working before I don't know what happened.

Is there a way to rebind the key? I've looked in all the places I thought it would be but I cant find it.

You can rebind the key in NEI.cfg by going to the 55th line (at least in my version), and change world.moboverlay=65 to whatever number that matches the key code of the button you want to toggle it.

You can find a reference for the LWJGL key codes on the Minecraft Wiki, or directly from the Javadocs...

Keyboard mapping taken from the wiki page (for archival purposes):