You can delete a custom dashboard.

The pre-set dashboards included in a publication site cannot be deleted.

1. Open the dashboard you want to delete.
   1. Select the main menu , and then select the publication site, which includes the dashboard you want to delete.
   2. Select the name of the active dashboard, and then select a dashboard to open it.
2. Select the Manage icon in the upper-right hand corner.
   
3. Select the three dots to the right of the dashboard name, and then select Delete.
4. A confirmation message appears. Select Delete.

The custom dashboard is deleted.