(fn) Function Key keeps bringing up Mission Control. How do I disable it? I have looked all around and have found no answers? any ideas?

  • 1
    The fn key at the lower left of the keyboard by itself is invoking Mission Control?
    – Daniel
    Aug 31, 2011 at 4:20
  • @Daniel Yes it does. If you see my post below I gave some more info about the settings. Not sure where I can deactivate this. It is ironic that I can't find an easy fix to this. Most likely the setting is in some random place just need to locate it.
    – Brandon
    Aug 31, 2011 at 15:17

2 Answers 2


I was able to replicate the problem. Here's what worked on my machine to fix it:

  • Go to System Preferences » Mission Control
  • Under Keyboard and Mouse Shortcuts, go to Mission Control.
    • If it's set to fn, set it to some other value (or the - at the bottom of the list to disable a keyboard shortcut for Mission Control).
    • If it's not set for fn, but fn keeps triggering it (which happened to me), change it to anything else, then change it back to the value you want it to have.

On my machine, that made fn stop triggering Mission Control.

  • This answer solved the problem for me. Thanks! The first answer does not address the actual question/problem.
    – Sam
    Feb 20, 2018 at 20:24
  • It's 2022, this bug still exists and this workaround still works.
    – Hannes
    Nov 26, 2022 at 0:03

To disable the functions of all Fn keys you can go to Apple > System Preferences. Then click on Keyboard and check the box that says "Use all F1, F2, keys as standard function keys"

As for jsut Mission Control you can go to in System Preferences to Mission Control, and you'll find there some list menus that let you choose the keys for the different features of Mission Control. At the bottom there is a "-" which turns it off.

  • That does not disable "all Fn functions" by far. I use Fn in tandem with nearly every key on my keyboard. That preference only changes the behavior of the Function (F1-F12) key row, and otherwise does nothing to the Fn button. Nov 19, 2011 at 7:28

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