I’m sure anyone of you log onto server notice that server manger start automatically. This is particularly issue for remote desktop environment when regular user log in, they will be presented with server manger. I’ve no idea why Microsoft allow this in RDS environment in first place. Anyways, here how you can disable it for all users.
There is two way you can do this first via GP, which is my preferred method.
First bring up group policy editor and create a GP and navigate to Computer configuration, Administrative Templates, System, Server Manger and then open ” Do Not Display Server Manger Automatically at logon” and click enable.

Otherwise, ( But this will need to be run on each servers) run power shell in admin mode,
Get-ScheduledTask -TaskName Server Manger | Disable-ScheduledTask -verbose
Done!!