I don't want to open a door in the company. What kind of wallpaper should I use to cover it and make a background wall?

There are many kinds of wallpaper: PVC wallpaper (commonly known as plastic wallpaper), oily wallpaper, water-based wallpaper, paper wallpaper and so on. See if your walls are often wet. The days in the south are different from those in the north, so the choice of wallpaper is different. In rainy days in the south, you should choose some oily paper and water-based wallpaper, and in the north, you should also choose some paper and plastic wallpaper, but plastic wallpaper is not flame retardant and has a little toxicity. It is recommended to choose some neutral wallpaper.