ServerManager is a useful application for installing, configuring and managing roles and features on a Windows Server machine. However, once your system is configured, it can be a nuisance by popping up when you don’t need it and eating up system memory.
Here are two methods to disable the ServerManager application from starting up on system boot. The first disables the scheduled task that is responsible for launching the application at system boot, and the second disables the application from launching in the registry.
Disable the Scheduled Task
Get-ScheduledTask ServerManager | Disable-ScheduledTask
Disable via the registry
Set-ItemProperty -Path 'HKLM:\Software\Microsoft\ServerManager' -name "DoNotOpenServerManagerAtLogon" -Value 1