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This is expected behaviour because your data source is ultimately from a data base, so although people can view the visualisations related to the table in your data source, they do not have access to the data source tab because then they could have access to the other schemas in your data base. It's just to make things secure.
To go around this, create a Tableau Extract TDE/hyper FILE and then connect to this in your visualisation. This means your data extract is just a file type and you'll be able to go to the data source to view the data.
Thank you Mavis, that's annoying but I guess it makes sense. It would be nice if the documentation was a little more clear on that!