As the title suggests, how can I rename a page group?
Yes, you will need to create a new page group and update the page accordingly.
I hope this helps clarify!
In order to rename a Page Group across multiple pages, you will need to edit each of the pages that are in that group and update the Group Name in each page.
Updating the name is the same process as originally creating the Page Groups (see Step 1: Set Up Your Page Groups):
Hope this helps!