使用groupRowRenderer在箭头前设置间距

const groupRowRenderer = ({ key, index, style, groupKey, childCount, isExpanded, level }) => {
  // 设置间距
  const marginLeft = level * 20; // 设置每一级的间距为20px

  return (
    <div key={key} style={{ ...style, marginLeft }}>
      {/* 在箭头前设置间距 */}
      <span style={{ marginLeft: 10 }}>
        {isExpanded ? <i className="arrow down" /> : <i className="arrow right" />}
      </span>
      <span>{groupKey}</span>
      <span>({childCount} items)</span>
    </div>
  );
};