To redirect Contact Form 7 to a single confirmation page, or multiple confirmation pages by form ID add the following PHP snippet to your WordPress theme's function.php file: -

Redirect Contact Form 7 to a single confirmation page

Change 'https://yourdomain.com/confirmation/' to reflect your own confirmation page URL

Redirect Contact Form 7 to multiple confirmation pages

In this instance '119', '120'are the Contact Form 7 IDs so you will need to extrapolate your own IDs and these are clearly displayed under Contact > Contact Forms in the displayed forms 'shortcode' '[contact-form-7 id="119" title="Contact form 1"]' and also when you edit the form it's shown in the URL i.e. /wp-admin/admin.php?page=wpcf7&post=119&action=edit