There are two different types of backgrounds.
You can customize the background of the paper. Click on the background icon in the view dialog to add it. There are 8 different background templates available.
Width and height are the general settings of the box.
Additionally, you can customize the color of the background.
The count and spacing property allows you to create music paper. For music paper, set count to 5 and spacing to more than the width.
The image background type allows you to use an image as background.
The scale in x and y direction can be changed if this image to small or big.