Use the Workspace option in the application bar. by default it says Expanded Mode. Click the menu and reselect the mode you want.
You can also create custom workspaces by choosing Save Current from the same menu.
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Thanks, Jim! That did it. Wow, was that not intuitive...
Glad it worked for you. The workspace switcher had been around since CS4 and pretty much all the suite apps have it. I think it's part of the OWL interface adobe now uses