Tabs的导航栏如何居顶部显示，不居中显示?

@Entry
@Component
struct Index {
  @State currentIndex: number = 0
  controller = new TabsController()

  @Builder
  TabBuilder(index, name) {
    Text(name).padding(10)
      .fontColor(this.currentIndex == index ? Color.Green : Color.Black)
      .onClick(() => this.controller.changeIndex(index))
  }

  build() {
    Row() {
      Column() {
        this.TabBuilder(0, '首页')
        this.TabBuilder(1, '分类')
      }

      Tabs({ controller: this.controller }) {
        TabContent() {
          Text('首页内容')
        }

        TabContent() {
          Text('分类内容')
        }
      }
      .barWidth(0)
      .vertical(true)
      .backgroundColor('#30f0')
      .onChange(i => this.currentIndex = i)
    }.alignItems(VerticalAlign.Top)
  }
}