How can I clone a chart
To clone a chart you need to go to the charts library, which could be found here: Dashboard > Media > Visualizer Library.
Once you open the library, you will be able to find a chart what you need. When you find it, click on "Clone" icon.
After you click on "Clone" icon, the chart will be duplicated and appear in at the beginning of the list. After cloning a chart, you can do whatever you need with it.