Before deploying Drive Encryption without Self-Protection, you need to ensure that the 'Disable Self-Protection' checkbox is selected in the Product settings.
To install Drive Encryption without the Self-Protection feature enabled, you need to ensure that the keyword NOSELFPROTECTION is included in the command line parameters for the Drive Encryption deployment task in ePO - On-prem. This step disables the Self-Protection feature until the first policy enforcement, and ensures that the self-protection component is not installed on the system.
For more information on installation steps, see Deploy Drive Encryption to the client system.