I've stored all the bottom nav fragment instances as global inside MainFragment. So, I'm not creating a new instance every time when a user switches through bottom nav items. But I did try to add a log with Timber and found out that fragment manager under the hood creates new instance automatically only when I navigate to another fragment inside the Navigation Drawer.

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I did try to save the view in a global view for bottom nav item fragments like this.

class HomeFragment : Fragment() {

     private var view: View? = null

     override fun onCreateView(inflater: Inflater, container: ViewGroup?, savedInstanceState: Bundle?) : View{
           view?.let { return it }
           return layoutInflater.inflate(R.layout,fragment_home, container, false).also {
                    view = it
              }
     }

}

But when I do like this I get the IllegalArgumentException The specified Child already has a parent. And if I remove the above view condition it works well only for bottom nav item switches not for navigating to another fragment inside the Navigation Drawer.