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As per the title I'd like to configure the preference entitled

Group windows by application which is found in Preferences > Mission Control.

Most settings seem to have something like

defaults write com.apple.xxxx setting-name -bool false

But i can't seem to find one for this setting.

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The defaults command for Group windows by application in System Preferences > Mission Control is e.g.:

defaults write com.apple.dock expose-group-by-app -bool false
  • The value can be true or false.

However, that will not immediately change it in the UI and it may get overwritten anyway.

The safest way to change it is from the UI.

Note: As suggested in the comments one can use killall Dock directly afterwards however, killall Dock will force all minimized windows to show, as well as it's visually disruptive. I'd suggest using AppleScript to change it as it will not force minimized windows to show nor it is as visually disruptive.

The following AppleScript code will check/uncheck the Group windows by application checkbox in System Preferences > Mission Control, and will not cause the same visual disruption that killall Dock will. It can be saved as an AppleScript application in Scrip Editor.

tell application "System Preferences"
    set the current pane to pane id "com.apple.preference.expose"
    tell application "System Events"
        click checkbox "Group windows by application" of group 2 of window "Mission Control" of application process "System Preferences"
    end tell
    quit
end tell

Note; This AppleScript code was tested under macOS 10.12.5 and my need adjusting for some earlier versions of OS X.

  • You might want to follow that defaults command with killall Dock to restart the Dock process. – IconDaemon Aug 23 '17 at 14:40
  • @IconDaemon, Yes one can do that however killall Dock will force all minimized windows to show as well as it's visually disruptive. – user3439894 Aug 23 '17 at 14:50
  • On recent versions of macOS, the preference key has been changed to expose-group-apps. – saagarjha Jun 28 '18 at 18:28

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