I don't have the return problem that you have. I am returned to the place where I was when I clicked on the message subject.
However, since the change in the board, I have different colors for my subject headings in the index. In the past new, unread messages were a bright green color, - now they are blue. In the past, once I read a new message, the color of the subject line in the index became green, - now they are a blue-gray color. Before the change, it was easy to distinguish between what had been read and what I needed to read. Now the colors are so close, it's not easy to tell the difference. Also, the whole thing is much slower.