See Citrix's Seamless Configuration Settings; specifically, the flag for DISABLE SYSTRAY AGENT.
Note: for multiple icons or processes on the Terminal Server itself, see the Symantec article below:
Terminal Server resources are consumed by multiple instances of Symantec Endpoint Protection processes
References
Please see the Symantec Endpoint Protection Terminal Server and Citrix Best Practices White Paper.
Title: 'Citrix and terminal server best practices for Endpoint Protection'
https://knowledge.broadcom.com/external/article?legacyId=TECH91070