lol, atmosphere is the most important and basic component of switch cfw scene and people don't know how to use/launch vanilla atmosphere cause of kosmos package and its automated user friendly experience... that's funny.
Kosmos is atmosphere, except it's just launched differently and configured through hekate mostly. To use vanilla atmosphere, you need to launch it via fusee-primary payload. And to configure it, take a look at its configs inside /atmosphre/config_templates (those are just templates, actual configs go into /atmos/configs) and BCT.ini as well.