Flutter Cartesian chart widget provides support for customizing the corners of the Rect series types using the borderRadius property of the chart series such as column, range column, bar, stacked column, and stacked bar. By using the borderRadius property, you can change the radius of the corners so that the corners can be shaped in either in circular or elliptical shapes.
Documentation: https://help.syncfusion.com/flutter/cartesian-charts/chart-types#rounded-corners
To run this application, you need to first clone or download the ‘rounded corner customization flutter chart’ repository and open it in your preferred IDE. Then, build and run your project to view the output.
For more help, check the Syncfusion Flutter documentation, or Flutter documentation.