Explanation:
You can export data from a visualization in the report. You can export the summarized data used to build the visualization and the underlying data behind the visualization as CSV or Excel files.
You cannot access multiple datasets in the same report. Power Bl reports are based on a single dataset with capabilities to interact with your visualizations, like applying filters and slices and exporting the data.
You cannot see the underlying data behind a visualization without exporting it. You can see the summarized data in a report visualization using the Show as Table option. To see the underlying data behind a visualization, you need to export it first.