How to change width and height of a chart in Visualizer
After you have created a chart, go to Media > Visualizer Library.
Click edit on the chart already created, select your chart, and on the next page, click Settings.
Go to Layout and Chart Area option and select Layout
Enter the desired width and height of the chart in Width And Height Of Chart option.
Additionally, you can change Stroke's width, Stroke Color, and Background Color in the same tab.
Click on Save Chart button to make changes!