How to change start destination of a navigation graph programmatically [Jetpack]

Question

Basically, I have the following navigation graph:

I want to change my starting point in navigation graph to fragment 2 right after reaching it

Answer 1

In MainActivity.kt

    val navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
    val inflater = navHostFragment.navController.navInflater
    val graph = inflater.inflate(R.navigation.booking_navigation)

    if (isTrue){
        graph.startDestination = R.id.DetailsFragment
    }else {
        graph.startDestination = R.id.OtherDetailsFragment
    }

    val navController = navHostFragment.navController
    navController.setGraph(graph, intent.extras)

Remove startDestination from nav_graph.xml

?xml version="1.0" encoding="utf-8"?>