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Avoid triggering Hot Corners accidentally Apps
The truth is, our old friend Rob Griffiths posted a version of this hint years ago. But that one was enough incarnations of OS X ago that we felt it's worth a refresh.

Many of us use Hot Corners (accessed from System Preferences -> Mission Control or System Preferences -> Desktop & Screen Savers) to trigger various actions. On my Mac, slamming the mouse to the bottom right corner reveals the desktop; the bottom left corner triggers Mission Control. You can also use the corners to trigger things like Notification Center, Launchpad, starting a screen saver, or putting your display to sleep.

But anyone who uses Hot Corners (which OS X refers to interchangeably as Active Screen Corners) triggers those mouse-controlled shortcuts accidentally sometimes. The solution is this: When you're choosing a Hot Corner setting from one of the drop-down menus, hold down your preferred modifier key or keys. You'll see the options change from, say, Mission Control to Option Mission Control" instead.

From then on, your corner will only work when you're also holding down the modifier key(s) you specified. Now, trips to the Apple menu won't trigger your Hot Corner shortcut—unless you're pressing your selected modifier key, too.
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Avoid triggering Hot Corners accidentally | 17 comments | Create New Account
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Avoid triggering Hot Corners accidentally
Authored by: Strod on Jun 25, '13 09:10:52AM
On my Mac, slamming the mouse to the bottom right corner reveals the desktop; the bottom right corner triggers Mission Control.
Holy multifunctional hot corner, Batman!

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Avoid triggering Hot Corners accidentally
Authored by: LexFriedman on Jun 25, '13 09:48:33AM

Ha—fixed!



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Avoid triggering Hot Corners accidentally
Authored by: glgray on Jun 25, '13 12:04:05PM

This comment is why I love Mac forums. :-)



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Avoid triggering Hot Corners accidentally
Authored by: gmachen on Jun 25, '13 09:38:06AM

Now if only from day one, a hidden Dock would not reveal itself when the pointer reaches its screen edge unless accompanied by a user-selectable command key! (Or a click.) Anyone know of a shareware utility that will do that? That godforsaken Dock rearing its ugly head when unwanted has been the bane of my existence for over a decade!



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Avoid triggering Hot Corners accidentally
Authored by: xianman on Jun 28, '13 04:17:15PM

You’re not the only one! I have been asking this question myself since the first betas of OS X.

My current work around is to add a very long delay to the dock popping open like so:
defaults write com.apple.Dock autohide-delay -float 10; killall Dock

Then I set F5 on my keyboard to hide/show the dock, so I can control when it pops open.

But yeah, a modifier key is what I’ve always wanted to control the dock as well.



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Avoid triggering Hot Corners accidentally
Authored by: afranz on Jun 25, '13 09:57:54AM

Hello,
good hint using it for a while, but my settings aren't sticking, after a few reboots the modifier key is forgotten and the action is triggered without it.



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Avoid triggering Hot Corners accidentally
Authored by: ChipMck on Jun 25, '13 12:13:40PM

Been using this several years now. No problems with the modifier key setting



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Avoid triggering Hot Corners accidentally
Authored by: capacity on Jun 26, '13 11:33:41AM
For me, losing the modifier key happens when I show a Keynote presentation, regardless of whether it's on my laptop screen or an external monitor/projector. This has happened on many laptops and versions of OS X. I've reported this to Apple a few times over the years, but the bug has never been fixed. http://www.apple.com/feedback/macosx.html

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Avoid triggering Hot Corners accidentally
Authored by: snit on Jun 30, '13 08:29:56AM

Thank you!

I have been running into this as well but never figured out the cause. That is an absurd bug... I will report it as well.



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Avoid triggering Hot Corners accidentally
Authored by: dandj on Jun 26, '13 04:18:22PM

The Hot Corners preference seems to have taken over some of the functionality of CornerClick (http://gschueler.github.io/CornerClick/), which still works fine on 10.8 and offers clickable corners with modifiers and a couple of extra functions: opening a URL and opening an application.

Edited on Jun 26, '13 04:19:11PM by dandj



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Avoid triggering Hot Corners accidentally
Authored by: torch_55 on Jun 26, '13 06:42:18PM

Nice!!! This will end my frustration - when I accidentally hit the corner to put the screen to sleep, I have to enter my password to wake it up & get back to sleep. One time I just couldn't see the pointer and actually did this three times in a row. Not a lot of fun...



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Password delay
Authored by: SeanAhern on Jun 27, '13 09:39:22AM

Sounds like you should probably add a delay before you have to type in your password upon triggering sleep. Go to System Preferences -> Security & Privacy -> General. There's a menu that lets you set how long before the password is required. Set it to 5 seconds, and you should be much happier.



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Avoid triggering Hot Corners accidentally
Authored by: gmachen on Jun 28, '13 04:27:25PM
Thanks, xianman, but it doesn't seem to work in Leopard 10.5.8. I inspected ~/Library/Preferences/com.apple.Dock.plist, and it's in there, but no joy.

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Doesn't work fully with Screen Saver
Authored by: aGr[j5(6WU on Jul 01, '13 02:06:59PM

OS X 10.8.3 here, and this doesn't seem to work as intended with the Screen Saver. If I hold Option and mouse to the lower RH corner, Screen Saver activate–but then immediately de-activates on releasing the Option key! Clearly, releasing the Option key counts as a wake-from-screensaver activity. A workaround is to require password to leave Screen Saver. But still: I call that a bug.

Anyone else experiencing this?



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Avoid triggering Hot Corners accidentally
Authored by: TechnoBob on Jul 02, '13 03:11:10PM

aGr[j5(6WU [really!?] wrote "If I hold Option and mouse to the lower RH corner, Screen Saver activate–but then immediately de-activates on releasing the Option key!"

Release the Option key immediately upon entering the corner. Screen Saver will activate an instant later, and your finger will already be off the button, so no wakey-wakey.



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Avoid triggering Hot Corners accidentally
Authored by: robogobo on Oct 25, '13 05:51:47AM

This is especially good at reducing the frustration of other people when they're using my Mac. I don't care so much about accidentally triggering hot corners, and I rarely do, but some people are a little wild with the mouse and it gets in the way. So now I'm modifying my behavior to help others. Ain't that nice of me?



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Avoid triggering Hot Corners accidentally
Authored by: Dave on Oct 31, '13 10:08:27AM

I hate hot corners. I have tried everything to disable it. The "Apple Geniuses " couldn't even figure it out. So pondering the situation in great frustration it occurred to me ……. I bet the "Magic Mouse" has something to do with it? Sure enough the Magic Mouse triggers Hot Corners. No problem with the trac pad or usb mouse. Now can someone tell me how to use the magic mouse without triggering hot corners?



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