I find the Finder window’s sidebar immensely useful. By default, it shows a number of useful folders and locations you might need quick access to, and you can drag in folders, servers, smart folders, and more. But what do you do when the sidebar disappears, and the View menu’s Show Sidebar item is grayed out? This happened to me recently, and I was baffled. Restarting my Mac didn’t solve it, nor did some advice on resetting a Finder preference
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