Windows and How to Work Them
In designing OS X, one of Apple’s key goals was to address the window-proliferation problem. As you create more files, stash them in more folders, and launch more programs, it’s easy to wind up paralyzed before a screen awash with overlapping rectangles. That’s the problem admirably addressed by Mission Control, described in detail on Starting Split Screen Mode, Method 2. Some handy clutter and navigation controls are built into the windows themselves, too. For example:
The Sidebar
The Sidebar (Figure 1-3) is the pane at the left side of every Finder window, unless you’ve hidden it. (It’s also at the left side of every Open dialog box and every full-sized Save dialog box.) It’s slightly translucent—your desktop picture shines through it just a little bit.
The Sidebar has as many as four sections, each preceded by a collapsible heading.
Note
The little flippy triangles that could collapse (hide) each Sidebar heading are gone. Instead, if you point to a heading without clicking, a tiny Hide or Show button appears. Click it to collapse or expand that heading’s contents.

Figure 1-3. Good things to put in the Sidebar: favorite programs, disks on a network you often connect to, a document you’re working on every day, and so on. You can drag a document onto a folder icon to file it there, drag a document onto a program’s icon to open it with the “wrong” program, and ...