What must the data source owner do to allow report editors to modify data fields?

To allow report editors to modify data fields, the data source owner must enable field editing in reports. This setting specifically grants report editors the ability to adjust field properties like names, aggregation methods, and data types within the report itself, without altering the underlying data source. Using the owner's credentials is about data access, not field modification permissions. Giving edit access to the data source would allow editors to change the data source configuration, which is broader than just field editing in reports and might not be desired. Preventing editors from changing access and adding new people is a security measure unrelated to field modification.