@Matteo Pocchiari Yes, the azure ml dataset which is registered from your labels after exporting it cannot be used directly in the designer because all the modules are using dataframe ports as input to their respective modules. You can however follow these steps to convert the labeled datasets to pandas dataframe and re-upload the downloaded file as a dataset which can be used in the studio with the correct format.
@Lu Zhang (MSFT) Is there any other workaround for this scenario?