Drop the breadcrumb, the collapse button, and two shortcuts
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.
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