Since this is published to Tableau Public, it is accessible for anyone to download or share, and thus it is not possible to disable this. Tableau Server provides more functionality in terms of this and may be a possible alternative for your company:
Hi Tracy I am actually a Tableau Server client. Since our server requires authentication means we should not to publish to our server but instead publish to Tableau public.
Any thoughts on this?
Tableau Digital may be a good solution for you. It is basically Tableau Public except you have the option to disable download the workbook and data. Digital is a paid service hosted by Tableau. Here is the webpage for more details
Great - Thanks Jazmyn.