When logging on to a Windows Server (since 2008), the server manager opens automatically, but you do not necessarily need it.
Personally, I even find that it tends to slow down the system.
In this tutorial we will see how to disable it with a GPO.
GPO: disable the server manager
3. Change the GPO and go to Location: Computer Configuration / Policies / Administrative Templates / System / Server Manager and edit the setting Do not automatically display Server Manager at logon 1 .