Thanks Paul. In my case "Hide Studio" had gotten checked. I had Reset Studio several times but for some reason the Hide Studio never caught my eye. My bad.
Something that did confuse me was the use of "Studio" in the interface but "Panels" in the help file. Today I did find "Studio Panels" in the help file in one place, the workspace overview, but everywhere else the help file seems to just refer to that area as "Panels".
kentbigdog got a reaction from Paul Bravery in Layers Panel Gone