You use Endpoint Enterprise Security Suite package. 

 

https://www.dell.com/support/kbdoc/en-us/000125465/how-to-uninstall-dell-endpoint-security-suite-enterprise-for-mac

 

Or for the Advanced Threat Protection use Terminal:

 

https://www.dell.com/support/manuals/en-us/dell-dp-endpt-security-suite-enterprise/endptsecsuiteentmacag/command-line-uninstall-of-advanced-threat-prevention-for-mac?guid=guid-f303b3a6-cf6c-4fd8-b069-a48e052736b6&lang=en-us