Salesforce Adoption Dashboards---->View Component---->3 - Sales & Marketing Adoption--->Refresh---->drag the pie diagram to the LEAD Trend by Source-------->Components----->Wedges----->Lead Source.
After installing the "Salesforce Adoption Dashboards" in your DE account, as instructed Refresh the 3 - Sales & Marketing Adoption dashboard. Please follow the screenshots for more details:
Please check below post for more information
1) https://developer.salesforce.com/forums/?id=906F0000000BOLWIA4
2) https://developer.salesforce.com/forums/?id=906F0000000DDsuIAG
Install Salesforce Adoption Dashboards.
Salesforce Adoption Dashboards---->View Component---->3 - Sales & Marketing Adoption--->Refresh---->drag the pie diagram to the LEAD Trend by Source-------->Components----->Wedges----->Lead Source.
Let us know if this will help you
After installing the "Salesforce Adoption Dashboards" in your DE account, as instructed Refresh the 3 - Sales & Marketing Adoption dashboard.
Please follow the screenshots for more details:
Hope this helps you!
Best Regards,
Deepthi