Hello, Dear Stefano!

Please provide us with more details about your issue to understand it correctly.

We need some sample links or steps to reproduce etc.

Thank you.

Hello, Dear Stefano!

Thanks for your clarification.

If you want to avoid any 404 pages on your website, you may direct these links to the pages with content.

For example, it's possible to make these links equal:

https://www.svagokart.it/portfolio/  = >  https://www.svagokart.it/project/  via redirection.

To do this - please use these solutions: https://blog.hubspot.com/website/10-best-redirect-wordpress-plugins

Or you may perform this via .htaccess directives.

Best Regards!