code-lab/node_modules/vuetify/lib/labs/VTreeview/VTreeviewItem.css

.v-treeview-item.v-treeview-item--filtered {
  display: none;
}

.v-treeview {
  --indent-padding: 0px;
}

.v-treeview-group.v-list-group {
  --list-indent-size: 16px;
}
.v-list--slim .v-treeview-group.v-list-group {
  --prepend-width: 16px;
}
.v-treeview-group.v-list-group .v-list-group__items .v-list-item {
  padding-inline-start: calc(12px + var(--indent-padding)) !important;
}