Hi,
I have implementation of SEPM 12.1.5 at one customer site !
They have more than 1000 Clients and existing antivirus they are using is Sophos 10.3 i want to remove from SEPM console
while installing client packge for all clients . how to remove
You can use third-party security software removal feature
Third-party security software removal in Endpoint Protection 12.1
https://support.symantec.com/en_US/article.TECH195029.html
Look at SEPPrep:
Uninstall third-party security software using SEPprep
About the third-party security software removal feature in Symantec Endpoint Protection 12.1 RU1 MP1 and later