This is one of those features i always forget about. The window management dev and I were discussing another tip, when he showed the auto-hiding channel context menu. I keep forgetting its there.
Right-click on the tool window auto-hiding channel to invoke the context menu and click on one of the tool windows to slide it out from hiding.
Note in the picture that the Solution Explorer and the Class View are side by side, whereas the Properties Tool Window has some space separating it. This is because the Solution Explorer and the Class View are docked together and the Properties browser is docked next to it, along the edge.
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