Where you are using the Chatbot and Natural Language Querying to create a visual (in Discover Pro or Lite), Pyramid automatically selects the most appropriate type given the data in your NLQ. To do this it uses its AI-driven Smart Visualization engine. You can, however, override or change the automatically selected visualization type by adding the visualization type to your question, or just overriding the one that was selected. This is even possible when you are just exploring your visual at runtime!
Note: Natural Language Querying does not support custom visualizations.
Natural language querying and the Chatbot are common to a number of apps in Pyramid. For common information, see NLQ: Visualizations.