Normally when you hover you mouse pointer over stacked items (e.g. Applications and Documents folders) in the Dock there is no hover highlighting meaning you may click the wrong item. This tweak enables hover highlighting.
Start a new Terminal session (in Finder click Applications > Utilities > Terminal).
To enable this setting, type (or copy and paste) the following command:
defaults write com.apple.dock mouse-over-hilite-stack -boolean true
To reset this setting to the default value, type (or copy and paste) the following command:
defaults write com.apple.dock mouse-over-hilite-stack -boolean false
To activate this tweak immediately, type the following command, or wait until the next reboot:
killall Dock
Close the Terminal session by typing exit at the prompt.
Disclaimer: Making any changes to your system can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from these modifications can be resolved. Please follow the instructions carefully and use the information provided at your own risk.
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