Enabling (or disabling) Dark Mode is really easy in OS X, and this will impact how the Dock appears, all menu bars, menu bar items, and menu bar dropdowns, as well as the appearance of Spotlight on the Mac.
How to Enable Dark Menu Bar & Dark Dock Mode in Mac OS X
1. Open System Preferences from the Apple menu and go to “General”
2. Near the top of the preference pane check the box for “Use dark menu bar and Dock” to enable Dark Mode
You’ll instantly see the change in the menu bar at the top of the screen.
Pulling down a menu bar item reveals additional dark mode theming:
And the Dock at the bottom of the screen will appear against a transparent dark background rather than a transparent light gray background:
Some users may find the light text to be challenging with transparency, so disabling that or enabling Increased Interface Contrast can remedy that.
How to Disable Dark Mode in Mac OS X (the Default)
1. Return to System Preferences from the Apple menu and go to “General”
2. Uncheck the box for “Use dark menu bar and Dock” to disable Dark Mode and use the default light menu bar and Dock
This returns to the default settings of light mode in OS X, visible in the menu bar:
Light mode default settings are also visible in pull down menus:
And the default light mode also offers a much brighter Dock on the Mac.
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