Change the key bind of toogleing presprective from "F5" to "\"

I play with a bunch of mods in 1.12.2, and I also play Minecraft without mods (except optifine) and anytime I switch versions, all the key binds reset, and anytime I press F5, it went work, so I have to press FN and F5 at the same time. And I play on my laptop so people that have PCs are cruel to players that are on laptops, so PLEASE change the keybind of toggle prescriptive from F5 to \.