Which account__usage views are used to evaluate the details of dynamic data masking?

 To evaluate the details of dynamic data masking, the POLICY_REFERENCES and ACCESS_HISTORY views in the account_usage schema are used. The POLICY_REFERENCES view provides information about the objects to which a masking policy is applied, and the ACCESS_HISTORY view contains details about access to the masked data, which can be used to audit and verify the application of dynamic data masking policies.

References:

[COF-C02] SnowPro Core Certification Exam Study Guide

Snowflake Documentation on Dynamic Data Masking1