Hi Geetanjali,
Thank you for contacting Syncfusion support.
We checked the provided web sample and couldn’t find any code snippet related to Presentation library. However, we have created a sample to show how to set the data label of a chart in percentage format using Presentation library. Please review the sample and let us know if it satisfies your requirement.
In MS PowerPoint, the data label option – Percentage is not available for bar chart types. Please refer the below screenshot,
Similarly, IsPercentage and IsValue properties does the equivalent functionality for pie chart and bar chart respectively using Presentation library. You may also refer the following online UG documentation to explore more about working with charts,
Please let us know if you need any clarification on this.
Regards,
Devisri