A Weird Old Trick To See What’s In OS X Folders


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This preference allows you to “peek” inside folders when you press space over a folder in Finder during Quick Look. It’s actually quite useful when you try it.
Turn it on:

defaults write com.apple.finder QLEnableXRayFolders 1

Turn it off:
defaults write com.apple.finder QLEnableXRayFolders 0

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