The scriptable objects folder is located at:
Assets > ParallaxControlSystem > ScriptableObjects
It contains the default prefabs for use with configuring a project. The UI Setup Wizard tool utilizes the objects specified in the ScriptableObjects folder to populate the user-interface. Each ScriptableObject accepts a prefab object of the specified type.
The UPL_WizardElementsVariant contains the main prefabs used in building the project.