You can customize the color of the chart background and the appearance of the chart grid (vertical and horizontal lines). Every chart pane can have different settings here.

As every chart pane also has a header, you can also choose the font, colors and data shown in the header of every chart pane.

Learn more:

Changing the Background Color of a Pane

Changing the Style and Colors of the Grid

Changing the Font, Colors and Data of Headers