Okay, fixed! What I had to do was grab the top bar close to by not touching its left margin, just about (I think) at the e or the v in Preview. I discovered this by accident, moving the pane around, when suddenly a possibility opened up to dock it on top of Code View. Then I began to see a hint of such a possibility to the right side, but I couldn't get it to stay until I'd moved my cursor-grasp to just the right spot.
Whew!
Thanks all!
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