1. Go to dashboard edit mode
2. click on the setting icon of the pivot widget
3. go to miscellaneous settings
4. There is a checkbox named 'Hide Download Icon' which is marked by default
5. Uncheck this option to enable the download icon in the preview
6. Also uncheck the option 'Hide Icon in Preview' to view icons in preview mode
7. go to preview, hover on pivot widget and you will see a download icon at the top right corner
8. click on the download icon to download analysis in excel