Explore a groundbreaking approach to designing Extended Reality (XR) interfaces through this conference talk on MineXR, a novel design mining workflow and data analysis platform. Discover how MineXR collects and analyzes personalized XR user interaction and experience data, enabling the elicitation of customized interfaces. Learn about the innovative process where participants create interface elements using their own smartphone screenshots, place them in the environment, and preview the resulting XR layout on a headset. Gain insights from a comprehensive dataset of personalized XR interfaces, including 695 XR widgets created from 178 unique applications by 31 participants. Delve into the findings on XR widget functionalities, categories, clusters, UI element types, and placement. Access open-source tools and data to support future XR interface development and research.