Example using window layout info to be notified when user changes foldable screen state

FoldingFeature.kt

windowInfoRepository
   .windowLayoutInfoObservable()
   .observeOn(AndroidSchedulers.mainThread())
   .subscribe{ windowLayoutInfo ->
     windowLayoutInfo.displayFeatures.filterIsInstance(FoldingFeature::class.java)
       .firstOrNull ()?.let { foldingFeature ->
           if (foldingFeature.state == FoldingFeature.State.HALF_OPENED) {
               recyclerView.layoutManager = LinearLayoutManager(
                   context,
                   LinearLayoutManager.HORIZONTAL, 
                   false
               )
           } else {
               recyclerView.layoutManager = GridLayoutManager(
                   context,
                   3,
                   LinearLayoutManager.VERTICAL,
                   false
               )
           }
       }
}