Appearance / Layout toolbar button

There are 3 layouts, preview off, preview on side, preview on bottom. Each has advantages and disadvantages particularly since the message preview header is very large. I’d like to quickly and easily flip between two of them. A simple button we click on that moves from one to the other would be great. I’d like to remove spam with the preview off, but run through my known good email with it on. The option exists in settings, but it is too cumbersome to get to if we’d like to jump from one view to another.