Expert allows you to prevent GPTBot from accessing your site through a checkbox in the Control Panel. This checkbox adds GPTBot to your robots.txt.
Unlike adding noindex
to your robots.meta in the site header, which allows your site to be visited but not indexed by the crawler, disabling GPTBot access means your site will not be visited by the GPTBot crawler at all.
Once the box is checked in the Control Panel, the blocking script for GPT should show in robots.txt. If the box is unchecked, the script should not appear:
User-agent: GPTBot Disallow: /