Since your seats are usually close to the wall, there will be an empty space behind it, and this area is so small that nothing can fit here. Maybe you might want to do something in this area. There are also ways to better use this space. Here are a few examples:
This is a traditional way of solving your problem. You can add shelves to the wall behind the seat. By expanding this area at the same time, you can put your books on these shelves and show your living room as more distinguished.
This is another way to use the space behind your seat. You can use her sandwich like a sandwich between a wall and a small table. You can easily put your plants, lamps and frames on this table.