Fabian contributed to the ros2/rviz repository by developing a Namespace-based Marker Visibility Control feature and addressing a reliability issue in PointCloudDisplay. Using C++, Qt Properties, and ROS, Fabian implemented per-namespace visibility toggles that allow users to hide markers without deleting them, streamlining workflows for large marker sets. The technical approach preserved hidden markers for quick re-enabling, reducing overhead and improving usability. Additionally, Fabian fixed a bug where PointCloudDisplay with a decay time of zero retained excess messages, ensuring only the most recent message is kept. These targeted changes enhanced visualization accuracy, memory efficiency, and overall stability in RViz.