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Drag and drop to sides or anywhere didn't work. If moved into "Drag column header here" area, the bar went full page. Double-clicking bar header reduced it again.

But No. 2 worked! Thank you so m ...

Somehow I "undocked" the categories bar and couldn't get it back in its default location at upper right. Worse, in looking for a solution I've now got all the bars floating over the tasks area, which ...