It looks like you mentioned TreeSize v7.1.5 — a version of the popular disk space manager for Windows (by JAM Software).
In v7.1.5, these visuals are not just static charts but interactive maps. Users can "drill down" into a treemap to delete or move files directly within the interface, bridging the gap between analysis and action. Administrative Utility treesize v7.1.5
In an era of ever-expanding SSDs and deceptive "storage sense" features built into Windows, a dedicated tool like TreeSize remains irreplaceable. TreeSize v7.1.5 represents the culmination of decades of refinement: it is fast, cloud-ready, scriptable, and visually intuitive. It looks like you mentioned TreeSize v7