Dear Balu,
there are several ways how to mitigate a role. Best if you go to Access Management > Mitigated Roles (in Section Mitigated Access). There you can assign a mitigation control for your specific role and access risk. There is also another good way if you go through the access risk while performing a Role Level analysis (Access Management > Role Level (in Section Access Risk Analysis).
If you run a user risk analysis and select the check box "Include Mitigated Risks" you will see which user has the mitigation in place.
Best regards,
Alesandro