title: How can I keep mounted a screen without destroying its state and navigate between screens back & forth in react navigation 5?
body: <p>I have a video call screen in my react native app. I want to user to go back to app from video call screen and keep using app during call but when I try to go back to a screen in stack navigator video call screen gets unmounted and lost its state though call still running background. I want to keep mounted the video call screen and  navigate between the apps without destroying the screen state. Modal is not preferable in my case. Since using react navigation 5 can't use switch navigator also. Thanks in advance.</p>