Hello Michelle,
your blog articles appear in chronological order on blog landing page but you may change the way they appear under Store navigation menu (from alphabetical to chronological) by replacing DYNAMIC_BLOGCATEGORY_INCLUDING_ARTICLES section with links to blog articles selected manually from the ‘Article’ tab under Blog Content section in Store_navigation menu.
You’ll find many useful tips regarding Menu builder in this forum article. In case you need further assistance, do not hesitate to open up a support ticket here.
Kind regards,
Paulina