If you add -server to launch parameters the game will launch in dedicated server mode that looks like a dos window. There is a thread on dedicated server in this section. I prefer launching it with a shortcut to launcher.exe that has -server added to command line not through changing Steam launch options. In this way you can launch client at the same time and join your own dedi server.
If you want to run a server from game interface in Multiplayer >> Server as you do, you do not need to add -server to launch parameters.
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