If you haven't heavily customized your Dock using Terminal commands, this week's power tip can come in handy. Because this won't just get rid of Terminal customizations. It'll reset your Dock to its default settings, just like when you first took your Mac out of the box. Default apps will be restored to their standard locations, and preferences like magnification, hiding, and so on, will be reset.
- Open Terminal (located in the Utilities folder).
- Type (or copy and paste) defaults delete com.apple.dock; killall Dock
- Hit return.
Your Dock will now be new as the day it shipped. Customize again with care.