@Jain, Shreyans - Thanks for the question and using MS Q&A platform.
To prevent users from downloading data, you should change their role from Contributor to Viewer. Contributors can view and modify all content in the workspace, so switching their role to Viewer will restrict their ability to download data.
Check this similar thread for your reference: In Ms fabric i want the user able to view data but cannot download it in fabric warehouse.
For more information: Roles in workspaces in Power BI
MS Fabric is currently not supported in the Q&A forums, the supported products are listed over here Supported products on MS Q&A (more to be added later on).
You can ask the experts in the dedicated MS Fabric community forum.
Can you please open as a new thread in MS Fabric community: https://community.fabric.microsoft.com/t5/General-Discussion/bd-p/ac_generaldiscussion
Hope this helps. Do let us know if you have any further queries.
If this answers your query, do click `Accept Answer`
and `Yes`
for was this answer helpful. And, if you have any further query do let us know.