Minecraft wiki entry for Controls, associated text: Note: On many notebook computers and most Macs, "Function keys" (briefly "F-keys") do not operate in their default configuration. The player can often get around this by pressing the Fn key or sometimes the ⇧ Shift key while they press an F-key. To make F-keys work in macOS, go to the Apple menu → System Preferences → Keyboard and mouse and check the "Use F1, F2 etc. as normal keys." If the player choose the first option, they can then use the Fn key to switch F-keys back to actions they used to do (e.g. play/pause music, etc.). The player can also use the F-keys by holding the ⌥ Option button while pressing them.