Interesting. It was the default when I started using Calibre, and I liked it just fine. I can't even find an option to disable just the top toolbar. I can only find an option for hiding them in general which hides both of the toolbars. I wonder if you might have had both of them docked on the same side of the viewer, which is possible to do, but if you had it set up that way, it would probably look like more options were missing from the toolbar being added back in 4.3.
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