The chart lists every ancestor down the page, so a breadcrumb repeating that path above it, and a button to undo one step of it, were both saying what the chart already says. Going back up is a click on a level that is already on screen, which the removal makes the obvious move rather than one of three.
**All eukaryotes** goes with them: the root level is always drawn, so clicking Eukaryota is the same reset. **Flowering plants** goes because green plants sits right beside it and reaches the same branch in one more click.
Verified in the browser: no breadcrumb and no collapse button in the DOM, nine shortcuts left, and clicking Metazoa from a jellyfish lineage takes the route from `2759/33154/33208/6072/6073/6142` back to `2759/33154/33208`.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Fold the views into one panel, right-size the controls, and open Database from a group (#7)
