sitemap generator

Thank you very much.

The point lies in the fact that every time you change or update a page in DW, in theory it should regenerate a sitemap and put it online. And this requires: creating the sitemap, and doing FTP. It would be convenient if the system provided for an automatic update of the sitemap of the site, so as to only have to do the FTP without resorting to other tools, which sometimes do not generate a complete xml and which must then be revised and fixed. Adobe Muse, for example, put a new sitemap online at each FTP: it was a convenient function, which would also fit in DW.

No need for one.  Use this online site map generator.  It's free.

https://www.xml-sitemaps.com/

Site maps are helpful for new sites so search engines crawlers can index your site.   Google Docs tells you how to do it. 

https://developers.google.com/search/docs/advanced/sitemaps/build-sitemap

Make your sitemap available to Google by adding it to your robots.txt file or directly submitting it to Search Console.

It's a feature that was present, a long time ago, in Dreamweaver, that worked only on the real first pages, then that was not maintained anymore as soon as the web became really dynamic, moreover it remained in a proprietary format and didn't allow export (if I remember correctly).... finally, it has been removed.

It is true that there are many automatic generators online today, and this is the way to go, because DW has gone into minimum maintenance mode... no more new features will be added.