perhaps I did not understand...
but if you don't want pages to be indexed, the procedure is universal for any version of websiteX5 and/or for any other page made with any programme or CMS.

Remove the page from the SiteMap ( map , proprierty , remove the flag ... sitemap)

and put the noindex tag in the extra code

<meta name="robots" content="noindex, nofollow" />

on the first pass of the search engine bot, the page will be removed from the search engines.

https://developers.google.com/search/docs/crawling-indexing/block-indexing?hl=it

if the page is already indexed, by google, for example, and you want to have it removed quickly, you must notify the removal via the 'google search console'