The armrests and the sofa wall are the same, which means reliance and backing. A thick and stable wall is conducive to the career, and the work is prosperous and has something to rely on. On the contrary, if you lack the support of noble people at work, it will be difficult for you to get promoted.
As for the sofa wall, I suggest that it is best to place the sofa against a solid wall. If you don’t have one, you can place a screen.