The SingleStore team refactored their Visual Explain feature to improve its user experience, simplify maintenance, and reduce code complexity. They chose React Flow as the new library for visualizing query plans, which provided a better node graph layout, customizable rendering, and performance improvements. The refactor aimed to address issues with the previous implementation, such as a non-fluid movement, limited zoom levels, and unnecessary logic for zooming and panning. The team worked with the Product Design and Query Optimization teams to gather feedback and ensure the new feature met user expectations. Despite some challenges, the refactored Visual Explain achieved a better user experience while reducing maintenance efforts.