in src/baseBehavior.ts [116:128]
public renderSelection(hasSelection: boolean): void {
if (hasSelection) {
this.options.elementsSelection.style("opacity", (category: any) => {
if (category.selected) {
return 1;
} else {
return 0.5;
}
});
} else {
this.options.elementsSelection.style("opacity", 1);
}
}