Worked on the ros2/rviz repository to address a UI reliability issue by refining the visibility logic for startup panels and covariance shapes. Using C++ and ROS, implemented a targeted bug fix that ensures panels for disabled displays no longer appear at startup, aligning covariance shape visibility with each display’s enabled state. This adjustment reduced UI clutter and improved the initial user experience, particularly for new users, by providing a cleaner and more intuitive interface. The changes were regression-tested across typical RViz setups, with careful scoping to minimize risk and maintenance overhead while maintaining stability in UI state management and development workflows.