How to set a single wallpaper/background across dual monitors 如何设置双显示器的背景图片贯穿

1) Get the wallpaper which fits your resolution. For example, if both of your monitors' resolution is 1440*900, you should look for the wallpaper of 2880*900 resolution.

2) Set this image to background, select "Tile" for Position

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1) 选择一个适合你的显示器分辨率的背景图片。比如说，如果你的两个显示器的分辨率都是1440*900，那么你需要找适应分辨率2880*900的图片来做背景/墙纸
2) 设置这张图片为背景，选择“平铺”方式