Android 看不到选项菜单栏

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
    
    override fun onCreateOptionsMenu(menu: Menu?): Boolean {

        val menuInflater = menuInflater

        menuInflater.inflate(R.menu.food_add , menu)

        return super.onCreateOptionsMenu(menu)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {

        if(item.itemId == R.id.food_add_item){
            val action = ListFragmentDirections.actionListFragmentToRecipesFragment()
            Navigation.findNavController(this , R.id.fragmentContainerView).navigate(action)
        }

        return super.onOptionsItemSelected(item)
    }
}

我有2个片段，它们通过NavHostFragment连接到MainActivity.我试着做一个菜单，当你从右上角打开它时，屏幕上会出现第二个片段，但我看不到应用程序右上角顶部的栏(我也看不到顶部栏，我完全看不懂？)因为我看不到它，所以我根本不能测试菜单部分.

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item  android:id="@+id/food_add_item" android:title="Add food"></item>

</menu>

I need to see this个

Instead I see this when I run the app个

我想要查看和控制菜单栏和菜单.