By default, the email confirmation link is redirected to the My Account page. However, you can customize this email to redirect the confirmation email to redirect to login page created with user registration:
Go to User Registration->Settings->Emails->Email Confirmation and change the content:
Please click on this verification link {{home_url}}/wp-login.php?ur_token={{email_token}} to confirm registration.
to
Please click on this verification link {{home_url}}/login?ur_token={{email_token}} to confirm registration.
where login is the slug for the login page( created with user registration shortcode ). If you would like to redirect some other pages then you can use that page slug.
