Jetpack compose condition navigation

MainActivity.kt

package com.example.myapplication

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.ui.Modifier
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import com.example.myapplication.ui.theme.MyApplicationTheme
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.asStateFlow

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            val isAuthStatFlow = MutableStateFlow(false)
            val isAuth = isAuthStatFlow.asStateFlow().collectAsStateWithLifecycle()

            MyApplicationTheme {
                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                    if (isAuth.value) {
                        val navController = rememberNavController()
                        NavHost(navController = navController, startDestination = "main") {
                            composable("main", content = {
                                Column {
                                    Button(onClick = { isAuthStatFlow.value = false }) {
                                        Text("logout")
                                    }
                                    Button(onClick = { navController.navigate("profile") }) {
                                        Text("profile")
                                    }
                                }
                            })
                            composable("profile", content = {
                                Button(onClick = { navController.popBackStack() }) {
                                    Text("back from profile")
                                }
                            })
                        }
                    } else {
                        Column(modifier = Modifier
                            .fillMaxSize()
                            .padding(innerPadding)) {
                            Button(onClick = { isAuthStatFlow.value = true }) {
                                Text("login")
                            }
                        }
                    }
                }
            }
        }
    }
}