The menu settings are configured via the Control Panel. To access the Control Panel, in your WordPress admin panel go to Appearance > Bellows Menu.
Settings which are applied to a specific configuration can be controlled in the Configuration tabs. By default, you will have a Main Configuration, but Pro users can add Multiple Configurations
The Configuration settings include settings like the Skin, Accordion Folding, positioning & layout, image sizes, and fonts.
The Configuration settings also include Style Customizations, which can be set either through the Control Panel or the Customizer.
The General Settings tab contains settings that are global, applying to either all menus, or the plugin as a whole. This includes settings such as Custom CSS Tweaks, asset loading, and admin notices.