I use Discourse Classic, Windows 10, Chrome, which has always had SD on the left, with the thread title and forum in smaller lettering. Then a bog empty space until over on the right you have the search/hamburger/profile icons. Background was all white.
Now, every time I open a new thread/tab, I have a very dark blue banner with The Straight Dope Message Board spelled out in a large font, followed by The Straight Dope in smaller font, a small empty space, then the search/hamburger/profile icons.
It’s board specific as no other site has changed. Help me go back!