Android firebase firestore how to initialize recyclerview

Question

My project displaying lists according to the users's information

EventChangeListener() classify people based on mbti, region, etc ..

When I run this function

private void EventChangeListener() {

    firestore.collection("Users")
            //.whereEqualTo("mbti","ENTP")
            //.whereEqualTo("region","")
            .whereEqualTo("gender","")
            .orderBy("time",Query.Direction.DESCENDING).limit(50)
            .addSnapshotListener(new EventListener<QuerySnapshot>() {
                @Override
                public void onEvent(@Nullable QuerySnapshot value, @Nullable FirebaseFirestoreException error) {
                    if(error != null){

                        if(progressDialog.isShowing()){
                            progressDialog.dismiss();
                        }

                        Log.e("Firestore error",error.getMessage());
                        return;

                    }

                    for (DocumentChange dc : value.getDocumentChanges()){

                        if (dc.getType() == DocumentChange.Type.ADDED){
                            userArrayList.add(dc.getDocument().toObject(User.class));
                        }

                        myAdapter.notifyDataSetChanged();
                        if(progressDialog.isShowing()){
                            progressDialog.dismiss();
                        }
                    }

                }
            });
}

Lists appears.

And when I try to load other lists like this function

firestore.collection("Users")
            .whereEqualTo("mbti","ENTP")
            .whereEqualTo("region","")
            .whereEqualTo("gender","")
            .orderBy("time",Query.Direction.DESCENDING).limit(50)
            .addSnapshotListener(new EventListener<QuerySnapshot>() {
                @Override
                public void onEvent(@Nullable QuerySnapshot value, @Nullable FirebaseFirestoreException error) {
                    if(error != null){

                        if(progressDialog.isShowing()){
                            progressDialog.dismiss();
                        }

                        Log.e("Firestore error",error.getMessage());
                        return;

                    }

                    for (DocumentChange dc : value.getDocumentChanges()){

                        if (dc.getType() == DocumentChange.Type.ADDED){
                            userArrayList.add(dc.getDocument().toObject(User.class));
                        }

                        myAdapter.notifyDataSetChanged();
                        if(progressDialog.isShowing()){
                            progressDialog.dismiss();
                        }
                    }

                }
            });

The list is duplicated below the list that has already appeared.

I want the recyclerview to be initialized and only a new list will appear.

How can I do this?