After you create the web user list, use the web user list in a web protection rule to prevent any data violation.
In ePO - On-prem, select Menu → Data Protection → DLP Policy Manager → Rule Sets.
Create a new rule set or modify an existing rule set.
Create a new Web Protection rule or edit an existing Web Protection rule to include a web user list.
In the Web Protection rule page, enter the rule name, and description, and select Enforce On: Trellix Network DLP. You can use a web user list only with Trellix DLP Network Prevent.
Under the Condition tab, update all rule conditions. For End-user, select belongs to one of web user list (OR) and click … to add the needed web user lists. Click OK.
Enter the required Exceptions and Reaction.
Click Save.
Assign and push the policy to the appliance.