The list of identities policies that are applied to a user are stored as an attribute of the user's identity.
You can modify the task View User and on the Search tab edit the search screen. Here, in the section Select the fields that a user can search on: you will add from the drop down the attribute Identity Policy
Then, when accessing the task View User, on Search you select "Identity Policy" from first dropdown, contains from second dropdown and policy name in search value. And click search