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I’ve found another bug or design issue. In vertical tab mode, a “flexible space” is forced into the toolbar to shorten the address bar and it cannot be removed. I had a longer address bar before turning vertical tabs on and it is very noticeable in a few situations.
Edit: The excess space can be suppressed by turning the title bar on. Very buggy.
There is a possible fix!
Variant-B was “true” for me.