In Minecraft, pressing F3 (many devices require you to hold fn in addition) brings up various statistics. I went to the controls and tried to change this menu to a more convenient button, but could not find the control I needed to change. Where can I find this control, and is it possible to change it? Please keep in mind that I understand little about the game; I am asking on a relative's behalf.
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Based on the information at hand, it seems that you cannot change the function of the F3 key. It is one of the non-configurable controls in the game.
I hope this helps!