I closed the tweaker. With my full taskbar and tray this is what I see when 3 sketches are loaded. One is running and it has the serial monitor open, hence 4 icons.
I had to revise my Win 10 taskbar settings to get a light background. So far I have not found how to keep my preferred dark background but with WHITE labels like yours. Although these show so little that they would serve no useful purpose for me.
EDIT: And I cannot now restore my overall background (in all apps) to white, without my taskbar background also becoming white instead of black or dark blue as it was! Neither in my tweaker utility nor Win 10 settings...
SORTED: Eventually found the steps in this article: