@Davide Fiocco You can use the SDK to export the run/s using Run() or get_runs()
This sample provides an example to get all the files associated with a run. I think you can use the SDK to get all the runs with get_runs() and load the list to a dataframe and export the same to csv.
The portal does not have the functionality to export the table but we will provide the feedback to our team for upcoming updates to the portal. Thanks!!