I set the background color of the chart and trend in the editing interface, but after running, I found that the background of the chart is still white. I am sure that it has been saved, forced to refresh, and logged in again.
The chart component has the Background color property. But chart uses its own settings loaded from PlgChartPro.xml. You should find this file in your project and change properties in the XML file. You can create many XML files with different chart properties and use a particular file.