The Default User Interface
If you don't define any of your own UIs for a configurator model, the model uses a default UI at run time.
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            The default UI is created dynamically at run time if no generated UI is specified, using UI templates and UI template maps 
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            The default UI reflects any model changes, and doesn't need to be refreshed. 
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            The Single Page Navigation UI template map governs the default UI. This choice is predefined. You can't select a different UI to be the default UI. 
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            The default UI is also used for a configurable product model for which no configurator model was created. 
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            There's only a single default UI in use at a time. The same default UI is used for all configurator models that need one at run time.