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#11
I confirmed with one of our "themers", and what you are trying to do in Explorer can't be done - not without something more substantial, like WindowsBlinds.
Just install Qttabbar (Quizo's version) - free- and navigate thru the many options (some people have difficulty here) to find Appearance settings
E.g.
I've also done sthg that removes a lot of the off-white elsewhere.. sometimes it's a setting in a program (Thunderbird, Firefox, my Office software) - else it's a small reg hack that needs special support to reapply the theme after resuming from sleep e,g,