Hi @mrszop
Welcome to the Auth0 Community!
Unfortunately, It’s not possible to disable the automatic sending of verification emails via Auth0 Dashboard, and it’s possible, as you identified, when creating a user with Management API. You can read about that here → Disable Verification Email Sent on User Creation
If you think this feature would benefit Auth0, I encourage you to open a new thread in the Feedback category, explaining your use case and what you would like this feature to look like.
Thanks
Dawid