How to change width and height of a chart in Visualizer
1 Navigate to Visualizer > Chart Library.
2 Select the chart to be modified and click to edit it.
3 Switch to the Settings tab.
4 Open the Chart Size & Placement accordion.
5 Expand the Chart Size/Layout accordion.
6 Enter the preferred width and height of the chart in the Width And Height Of Chart option.

7 Additionally, you can change Stroke's width, Stroke Color, and Background Color in the same tab.
8 Click on the Save Chart button to make changes!