Welcome to the Auth0 Community!
Thank you for posting your question. It’s a great idea to introduce this kind of checkbox in the dashboard in a plug-and-play fashion. I encourage you to open a new thread in the Feedback category with your use case explained. However, you can achieve a similar experience by using Forms with a post-login action to check if the user’s email is verified, render a proper form, and allow or deny access to your application.
In the Forms, you’ll need only a Step with a Text or rich text attribute that tells your users to Verify their email addresses. Within an Action, you’ll check if the user’s email address is verified and, based on that, render a form informing your users to check the inbox. In the onContinuePostLogin, you can conditionally deny access to your application if the user email is still unverified or apply your logic here.
Link to that docs about Forms
Thanks
Dawid