HarmonyOS Tabs组件的Tabs如何左对齐？

@Entry  
@Component  
struct Index {  
  @State message: string = 'HelloWorld';  
  private tabsController: TabsController = new TabsController()  
  @State currentIndex: number = 0;  
  
  @Builder  
  TabBarBuilder(title: string, targetIndex: number) {  
    Text(title).fontWeight(targetIndex === this.currentIndex ? FontWeight.Bold : FontWeight.Normal).margin({ left: 10, right: 10 })  
      .onClick(() => {  
        this.tabsController.changeIndex(targetIndex)  
      })  
  }  
  
  build() {  
    Row() {  
      Column() {  
        Flex({ direction: FlexDirection.Row }) {  
          this.TabBarBuilder('页签1', 0)  
          this.TabBarBuilder('页签2', 1)  
          this.TabBarBuilder('页签3', 2)  
        }  
  
        Tabs({ barPosition: BarPosition.End, controller: this.tabsController }) {  
          TabContent() {  
            Text("页签1页面")  
          }  
  
          TabContent() {  
            Text("页签2页面")  
          }  
  
          TabContent() {  
            Text("页签3页面")  
          }  
        }.onChange((index: number) => {  
          this.currentIndex = index;  
        })  
      }  
    }  
  }  
}