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Depending on your Mac and model when pressing the F4 or the F12 key
you will display the Dashboard.
By default the dashboard is displayed as a Space.
You can disable this from: Settings --> Mission Control, by unchecking the
"Show Dashboard as a Space" checkbox.
The Dashboard will still be active.
To completely disable your dashboard, open a Terminal Window and type:
defaults write com.apple.dashboard mcx-disabled -boolean YES
and hit Return.
Now restart your dock by typing "killall Dock", in the Terminal Window
and hitting Return.
You can now hit the F4 or the F12 keyto verify that your dashboard has been completely disabled.