Welcome to the Auth0 Community!
To redirect the users after user verification via a magic link, you can set up the Redirect To URL in the Branding → Email Templates → Verification Email (using Link).
The user will be redirected to this URL after the action finishes. You can use the {{ application.name }} and {{ application.callback_domain }} variables. See Configuring the Redirect To URL for more information.
Thanks
Dawid