This is a particularly handy trick for when you have limited screen real estate and want to fit more of a windows display on screen. A perfect example of this are the Hackintosh owners out there that are working with small netbook screen resolutions and some windows just don’t display properly, or won’t even fit on the screen. Instead of changing the actual screen resolution and losing screen real estate, you can scale all windows within OS X up or down by using the Terminal:
defaults write -g AppleDisplayScaleFactor 0.8
This will render all displayed elements at 80% of their original size
killall Finder
To set back to the default simply change the Scale Factor to 1.0 like so:
defaults write -g AppleDisplayScaleFactor 1.0
If you want to make things larger and easier to see, scale up to 1.2 or more, just play around until you find what works best for you. Remember to kill the Finder after each change in order to make changes take place.
Note: Virtually scaling up and down GUI elements can lead to some quirky appearance issues with certain apps, so test scale factors to find what works best for you and your apps.
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