Did you know... How to have the Solution Explorer always show (or not show) the file currently opened in the Editor? - #161
Since the default is to have the Track Active Item in Solution Explorer enabled in the General Development Settings, the more appropriate tip is either how to turn it back on or to how to turn it off.
On the Tools - Options - Projects and Solutions - General page, there's the Track Active Item in Solution Explorer. When enabled, this will sync your solution explorer with the open document.
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