Disable Fn keys for Minecraft?

I currently use a laptop, where the keys from F1 to F12 each have a function. And the problem is that if I In Minecraft F3 wants to push, I still have to press Fn at the same time and that is really uncomfortable.

How can disable these functions of the keys only for Minecraft?

So you can substitute F3 for something else in the controllers

Where exactly?

In Minecraft

Here is the "path" to the settings: Esc (Menu) → Options → Control

There, find and change the F3 setting.