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Firebase can be set up to present a string instead of com.google.firebase.firestore.DocumentReference@26621628 by attaching a listener to the document reference and retrieving the document data, which can be displayed in a string format. For example, in Android, we can attach a listener to the document reference using the following code:

DocumentReference docRef = db.collection("users").document("alice");

docRef.addSnapshotListener(new EventListener<DocumentSnapshot>() {
    @Override
    public void onEvent(@Nullable DocumentSnapshot snapshot,
                        @Nullable FirebaseFirestoreException e) {
        if (e != null) {
            Log.w(TAG, "Listen failed.", e);
            return;
        }

        if (snapshot != null && snapshot.exists()) {
            String data = snapshot.getData().toString();
            Log.d(TAG, data);
        } else {
            Log.d(TAG, "Current data: null");
        }
    }
});

This code attaches a snapshot listener to the document reference that retrieves the document data and logs it in a string format. The data can be further displayed to the user in any desired way.