class MyBottomSheetFragment : BottomSheetDialogFragment() {
    //....
    override fun onStart() {
        super.onStart()
        //this forces the sheet to appear at max height even on landscape
        val behavior = BottomSheetBehavior.from(requireView().parent as View)
        behavior.state = BottomSheetBehavior.STATE_EXPANDED
    }
}