Hide the Mac Finder Window Sidebar
Apr 13, 2011 - 3 Comments

You can hide the sidebar from Mac Finder windows by hitting Command+Option+S, this command keeps the window toolbar buttons intact across making it different than than clicking on the grey pill-button.
If you’re not a fan of keyboard shortcuts, you can also select this option manually through the View menu and choosing “Hide Sidebar.” This change will affect all Mac OS X windows.

The sidebar reminds me of Windows, it looks nice turned off. It would be good if the grey button would activate this, I have never understood the purpose of it otherwise, it just makes windows look like Mac OS 9
[...] If you’re wondering why my Finder windows don’t have a sidebar, you can remove it with a keyboard shortcut. [...]
[...] you prefer to keep the toolbar, you can also try hiding the Finder sidebars only with Command+Option+S. That will also maintain the single window option too, unless it has [...]