Allow or block Applebot-Extended
User-agent: Applebot-Extended
Disallow: /Asks Applebot-Extended not to crawl any page. Well-behaved crawlers stop; it does not stop anyone who ignores robots.txt.
User-agent: Applebot-Extended
Allow: /Lets Applebot-Extended crawl everything. You only need this if a broader rule would otherwise block it.
Should you block it?
Blocking Applebot-Extended asks Apple not to use new crawls of your pages for training. It doesn't remove you from AI answers.