How To Hide The "Data Details" In The Toolbar Above The Workbook Or Dashboard View

Workaround 1:
Add "?:dataDetails=no" to the end of view URL, or use the "dataDetails" object parameters with value "no" to embed views into webpages .
Note: The embed code for Tableau Server 2022.3 and later and Tableau Cloud has changed to use the Embedding API v3. For a current list of classes and methods in the Embedding API v3, see the Embedding API Reference in the Embedding API help. 
Example:



Workaround 2: 
(For Tableau Server) Turn off Catalog capabilities for each site. For more information see Disable Catalog.
Note: When disabling Catalog, it may be necessary to wait a few minutes or to sign out for the change to appear.