How to remove back arrow from action bar in the home fragment when I'm using bottom navigation view

Question

I've created three fragement and toolbar for every fragment with label. I have used navigate up to switch between home fragment and other fragment. My problem is, in the main fragment i want to remove back arrow from the toolbar. I have tried this actionBar?.setDisplayHomeAsUpEnabled(false) on main activity but it didn't work.Please help me

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    val bottomNavView = bottom_nav
    val navController = findNavController(R.id.fragment_nav_host)

    setSupportActionBar(toolbar)
    val actionBar = supportActionBar

    val appbarConfig = AppBarConfiguration(setOf(R.layout.fragment_home,R.layout.fragment_favorite,R.layout.fragment_profile))

    setupActionBarWithNavController(navController,appbarConfig)

    bottomNavView.setupWithNavController(navController)
}

override fun onSupportNavigateUp(): Boolean {
    val navController = this.findNavController(R.id.fragment_nav_host)
    return navController.navigateUp()
}

}

Here is toolbar code on activity_main layout

<androidx.appcompat.widget.Toolbar
     android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:theme="@style/toolbarTheme"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorPrimary" />

Screenshoot

Answer 1

You need to disable homebutton for actionbar as below

   setSupportActionBar(toolbar)
   val actionBar = supportActionBar
        if (actionBar != null) {
            actionBar?.setDisplayShowHomeEnabled(false);
            actionBar?.setHomeButtonEnabled(false);
        }