Hi @scuderiadank,
Thanks for providing the URL!
Initially, I tested this on a normal page and it worked properly, but I noticed that the test page you provided is actually a single post, not a normal page. I was able to replicate this behaviour on my test instance on single posts. Please add the code below in the Additional CSS section that can be accessed using the link template below. Make sure you replace your-domain with your site domain. The code should help extend the tables to their desired size.
https://your-domain.com/wp-admin/customize.php
.single-post .is-layout-constrained.entry-content.wp-block-post-content {
max-width: 100% !important;
}
Have a great day ahead!