Incognito mode doesn't stop my kid

I've had the Norton App for about 6 months now. I can monitor what my son does on his regular internet but that isn't stopping him from using his incognito tab. Before I was getting notices when he went incognito and now I am not getting anything. This app is almost pointless when he can still continue to do whatever he wants on his internet. I saw post made about a year ago with comments saying you were working on this problem. It has been a year now, why is it taking so long to fix? This app cost money and should be more advanced then it is. The incognito situation should be fixed by now!