Are the sections just docked to each other which could be normal if you knew how to dock and undock them, or is something happening that doesn’t occur anywhere else in Photoshop?
You should be able to use Windows / Workspace / Reset (workspace name) to make it how it is when you first install PS.
Thank you VERY much.
Your definition "docked" led me to the answer.
I would NOT want to try resetting things to the way they were when I installed CS6 because that would probably undo ALL my settings.
However searching for "undock" on photoshop help page gave me the simple solution (click on the title of the panel and drag it away), so easy but impossible to figure out if you never did it before.
I find it a bit sad that it is far too easy to make annoying changes to the way software behaves, leaving the user to pull hair while trying to figure out what was done and undo it.
Thanks for steering me right.
Resetting a Workspace as I suggested does not "reset ALL your settings" to all tools and preferences, it just resets the window and toolbar visibility and layout. Maybe that's what you mean by "settings" the way your windows are arranged, but it doesn't seem too dangerous to me.