Thanks 3am for reply but doesn't work ( already tried that with a pink window color in fonts & system metrics )
I managed to zoom what I 'm trying to point out and can't remind if it is documented ( under w10 )
As you see , there is 2 zones in adressband I'm looking for the dark grey one ( set native dark mode )
I made some tries too with this theme
https://www.deviantart.com/devillnside/art/Strata-X-821573692Same , it seems whatever window color you pick there is something overriding at that location with a plain color but can't find it lol