In this case, cabinets can be used to cover the back of the sofa. If you are close to the wall, you can add a storage cabinet with an upward opening, which is almost as high as the sofa or slightly shorter than the sofa to fill the gap between the sofa and the wall and form a storage space. If it is far away, you can buy a cabinet with an opening away from the sofa. The cabinet can be as high as the sofa to form a storage space, or it can be thinner to form a space interval. You can also use some shelves higher than the sofa, which can not only put some furnishings but also form a space interval. Of course, it depends on the overall layout.