In Tableau Next, Row-Level Security is managed through the Data 360 platform's security layers rather than within the visualization itself.
Using Data Stream in Data 360, ensure that your DLO (Data Lake Object) or DMO (Data Model Object) includes the specific field required to apply RLS.
Navigate to Data Governance in Data 360 to create and configure an Access Policy for the specific DLO.
Note: For detailed instructions on creating and managing access policies, please refer to the documentations: Policy-Based Governance in Data 360, Assign Data Access
The configured access policy will automatically apply to all Tableau Next Visualizations and Dashboards that are built upon the secured DLO/DMO.
USERNAME() or FULLNAME() which are commonly used in Tableau Cloud or Tableau Server for RLS.005305555

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