When the Radar Line Chart view of the Formatting panel is selected (green highlight below), you'll be able to change the background color and scale the visual down to fit the canvas.
- Click here for a full list of formatting functions available for radar charts.
Background Color: change the color of the report background, without affecting the chart background.
Scale to Fit: when trellised charts are too large to fit on the canvas, you can scale them down.
Optimize Visual: the visual optimization engine in Pyramid is a heuristic that automatically redacts certain parts of a graphical visualization based on the amount of space provided.
In this example, the trellised radar chart was scaled down to fit the canvas, and the background color was changed to blue: