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I have a list of folders shown in list view mode in Finder. But for some weird reason the regular click to expand triangle button which is present on each folder icon has disappeared. This issue is only sticky in one of the many folders in the system.

Do you know how I can re-enable it back?


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up vote 22 down vote accepted

The window may be using one of the "Arrange By" options. Disclosure triangles are not available in "arranged" views. If that's the case, you can choose View > Arrange By > None or press +^+0.

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Yes! this solution work. As it turned out I must have put the folder in Arrange mode unconsciously. Thanks very much! – Benny Khoo Feb 12 '12 at 23:36
Thanks for this, thought it was related to a recent OS Update (which it might have been). – Chris Sparno Sep 26 '14 at 22:39

Have you tried restarting the computer or logging out and back in?

Try to restart the Finder using

killall Finder

in the Terminal. This application is located at /Applications/Utilities/

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Try to do this. Worked fine for me .

View > Arrange By > None

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