Trellix Drive Encryption is managed through ePO - On-prem using a combination of user-based policies and product settings policies.
ePO - On-prem allows you to enforce policies across groups of computers or on a single computer. Any new policy enforcement through ePO - On-prem overrides the existing policy that is already set on the individual systems. For information about policies and how they are enforced, see the product documentation for your version of ePO - On-prem.