CFG (BepInEx): Used for basic on/off toggles and general module settings. YAML: Used for more advanced, scalable rules.
Most players won’t need to touch the YAML files. As a quick switch: press Shift + ← or Shift + → to cycle between modes. (configurable keys)
For basic use, the CFG is usually enough. YAML is there for fine-grained control and to allow future features without breaking old configs.