请尝试操作属性offsetHorizontal和offsetVertical。

series: [{
    type: 'organization',
    name: 'Digital Transformation',
    keys: ['from', 'to'],
    data: [
      ['CEO', 'Department1'],
      ['CEO', 'Department2'],
      ['CEO', 'Department3'],
      ['CEO', 'Department4'],
      ['CEO', 'Department5'],
      ['CEO', 'Department4x'],
    ],
    levels: [{
      level: 0,
      color: 'silver',
      dataLabels: {
      color: 'white'
      },
      height: 25
    }, {
      level: 1,
      color: 'silver',
      dataLabels: {
      color: 'black'
      },
      height: 25
    }, {
      level: 2,
      color: 'green',
      dataLabels: {
      color: 'black'
      },
      height: 25
    }],
    nodes: [{
      id: '',
      title: 'CEO',
      name: null,
      color: "#000000",
      info: "CEO"
    }, {
      className: 'title',
      id: 'Department1',
      title: 'Department1',
      name: '',
      layout: 'hanging',
    }, {
      id: 'Department2',
      title: 'Department2',
      name: '',
      layout: 'hanging',
    }, {
      id: 'Department3',
      title: 'Department3',
      name: '',
      layout: 'hanging',
    }, {
      id: 'Department4',
      title: 'Department4',
      name: '',
      layout: 'hanging',
    }, {
      id: 'Department5',
      title: 'Department5',
      name: '',
      layout: 'hanging',
      level: 1,
      offsetHorizontal: 15,
      offsetVertical: 0,
    }, {
      id: 'Department4x',
      title: 'Department4x',
      name: '',
      layout: 'hanging',
      level: 2
    }],
  }],

现场演示：
https://jsfiddle.net/BlackLabel/0tk6n94L/
API参考：
https://api.highcharts.com/highcharts/series.organization.nodes.offsetHorizontal
https://api.highcharts.com/highcharts/series.organization.nodes.offsetVertical