SlidingPaneLayoutNavGraphs.kt

//https://developer.android.com/guide/navigation/navigation-pass-data#start
        //Primary and detail nav graphs require data passed to them to initialize them with their tab number.
        val primaryNavHostFragment =
            childFragmentManager.findFragmentById(R.id.primary_nav_host_fragment) as NavHostFragment
        var navController = primaryNavHostFragment.navController
        navController.setGraph(
            R.navigation.primary_nav_graph, bundleOf(
                TAB_NUMBER to args.tabNumber
            )
        )

        val detailNavHostFragment =
            childFragmentManager.findFragmentById(R.id.detail_nav_host_fragment) as NavHostFragment
        navController = detailNavHostFragment.navController
        navController.setGraph(
            R.navigation.details_nav_graph, bundleOf(
                TAB_NUMBER to args.tabNumber,
                PRIMARY_SELECTION to "Initialized with tab number ${args.tabNumber}"
            )
        )