draw all level 2 nodes expanded

src/components/InteractiveDendrogram.vue

@@ -324,7 +324,8 @@ function createDendrogram(result) {
   root.descendants().forEach((d, i) => {
     d.id = i;
     d._children = d.children;
-    if (d.depth !== 0) {
+    // modify here to adjust which level nodes are open
+    if (d.depth === 2) {
       d.children = null;
     }
   });