Visual Studio launches Engine instead of game

I’m not familiar with this extension but I would recommend that you have a look at UnrealVS. It a custom solution that offer a couple of extra Unreal related features including the management of commandline argument from a toolbar.

https://dev.epicgames.com/documentation/en\-us/unreal\-engine/using\-the\-unrealvs\-extension\-for\-unreal\-engine\-cplusplus\-projects