Hey Frank,
Thank you for reaching out via our Pre-Sales Channel! The design seen in the screenshot appears to be customization, though the styles could be integrated into the theme by the theme author. Our Settings Overview: The Events Calendar and Events Calendar PRO does a good job explaining how the plugin handles styles.
So to answer your question simply, you would need to implement custom code to mimic the design shown in the screenshot you shared with me, though I don’t think it would be too difficult.
Please let me know if this helps and feel free to respond with any additional questions or comments you have. Thanks again and have a great remainder of your week. Cheers!