I have created from Android studio a new Android ( Kotlin) project based on the « Bottom Navigation View Activity » template.

So, 1 activity with its XML template that contains the navigation part and 1 fragment only :

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:background="@color/white"
    android:layout_height="match_parent"
    android:paddingTop="?attr/actionBarSize">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment_activity_main"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/mobile_navigation" />

</androidx.constraintlayout.widget.ConstraintLayout>

When the first fragment ( “1” on the screenshot) is displayed, I want to add a button to navigate to another fragment, and allow the user , when clicking on the “back” button of the device, to come back to the original fragment. I tried with the fragmentManager approach as described in the official documentation without any results:

Row(
        verticalAlignment = Alignment.CenterVertically,
        modifier = Modifier
            .padding(10.dp)
            .border(1.dp, Color.DarkGray, RoundedCornerShape(5.dp))
            .background(Color.LightGray)
            .padding(10.dp)
            .fillMaxWidth()
            .clickable {

                fragment.parentFragmentManager.commit {
                    replace<ComboListFragment>(R.id.nav_host_fragment_activity_main)
                    setReorderingAllowed(true)
                    addToBackStack("name") // Name can be null
                }
...