HarmonyOS Tab如何居左对齐

参考示例如下：

@Entry
@Component
struct TabsExample {
  @State currentIndex: number = 0;
  private tabsController: TabsController = new TabsController();

  @Builder
  TabBuilder(title: string, targetIndex: number, selectedImg: Resource, normalImg: Resource) {
    Column() {
      Text(title)
        .fontColor(this.currentIndex === targetIndex ? '#1698CE' : '#6B6B6B')
      Image(this.currentIndex === targetIndex ? selectedImg : normalImg)
        .size({ width: 25, height: 25 })
    }
    .justifyContent(FlexAlign.Start)
    .width(50)
    .height(50)
    .alignItems(HorizontalAlign.Start)
    .onClick(() => {
      this.currentIndex = targetIndex;
      this.tabsController.changeIndex(this.currentIndex);
    })
    .backgroundColor(targetIndex === this.currentIndex ? "#ffffffff" : "#ffb7b7b7")
  }

  build() {
    Column() {
      // 页签
      Column() {
        Row() {
          this.TabBuilder("视频", 0, $r('app.media.startIcon'), $r('app.media.startIcon'))
          this.TabBuilder("评论", 1, $r('app.media.startIcon'), $r('app.media.startIcon'))
        }
        .width('100%').backgroundColor("#ffb7b7b7")
      }
      .width('100%')

      //tabs
      Tabs({ barPosition: BarPosition.Start, controller: this.tabsController }) {
        TabContent() {
        }
        .backgroundColor(Color.Pink)

        TabContent() {
        }
        .backgroundColor(Color.Red)
      }
      //.barWidth(130)
      .width('100%').barHeight(0)
      //.barMode(BarMode.Scrollable)
      .animationDuration(100).onChange((index: number) => {
        console.log('foo change')
        this.currentIndex = index;
      })
    }.height('100%')
  }
}