Option-click to Hide Apps Quickly
This trick has been available in the Mac OS for years, but many people still don't know it. If you have too many windows cluttering up your screen, you can hide specific ones easily as you work. When you're in any application, hold down the Option key and click on another app's window, on the Dock, or in the Finder to switch to that other app and simultaneously hide all the windows in the previously current app.
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Back in 2001, after I'd written several TidBITS articles about intriguing ways to store and retrieve information on your Mac, a number of readers attempted to impress upon me that for some folks, simpler is betterShow full article