Can I disable Chrome incognito mode if I still have admin access?

Not permanently, if you retain unrestricted administrator credentials. An administrator can change the Chrome policy back, and restricting permissions on the registry key does not solve that underlying problem.

For a stronger barrier, use a standard account day to day and have someone you trust control the separate administrator password. A separately managed device is another option. Either way, the restriction depends on who controls the admin access.

If you don't want another person involved, you can still add friction. Use a standard account and put a long admin password on paper somewhere inconvenient to access, such as in a locked container.

That isn't a secure lock against yourself. It gives you a pause before changing the setting, which may be enough to make the restriction useful.

Disabling incognito only removes one way to browse without keeping local history. Regular history can be deleted too, and other browsers or devices could still be available. It won't by itself block access to particular sites.

Also, incognito is not a guarantee that activity is hidden from websites or network providers. It mainly limits what Chrome saves locally after the session closes.

For the habit itself, consider support alongside the technical restriction. Talking with a therapist is one option if the behavior feels hard to control. A browser setting can add a hurdle, but it doesn't address what prompts the habit.