You can remove Trellix Agent from a system by deleting it from the System Tree on ePO - On-prem.
On ePO - On-prem, select Menu → Systems → System Tree, then select the systems from the list that you want to delete.
Select Actions → Directory Management → Delete .
Select Remove Trellix Agent on next agent-server communication, then click OK. Trellix Agent is removed from the system during the next Agent-server communication.