The Reporting (Beta) screen will eventually replace the legacy Reporting screen and will include a host of new and improved reports. The features and reports on this new screen will be rolled out in stages across several consecutive releases.
You can rerun an existing custom report that has already been generated.
To rerun an existing report:
In the My reports or All reports tab, on the right-hand side of a report, click the ellipsis (…).
From the menu, click Rerun report.
The report starts to generate. If the report contains a lot of data, it may take longer to generate.
When the report has finished generating, you will receive a notification that the report is ready to download.