Hi! Are you still looking for the template? It's one of the Brine family templates. More about Brine here: https://www.sarahhalliday.com/squarespace-tips/the-brine-family-template-index
And how to identify Squarespace 7.0 templates? https://www.silvabokis.com/squarespace-tips/how-to-find-out-which-squarespace-template-a-site-is-using
The button drop downs are folders. More here https://support.squarespace.com/hc/en-us/articles/360000938048-Folder-display-by-template
I'm not sure what you mean by ''the home page one-page scroll'. Maybe index pages? https://support.squarespace.com/hc/de/articles/205813748-Folders-vs-Index-Pages
Hope this helps.