No Templates
A user posted:
"I don't see any templates or settings on this page https://sites.google.com/new?ftv=1. I can only create a website based on a blank template. "
https://support.google.com/sites/thread/269400605?hl=en
They found the answer themselves:
"I found the solution. Language in "General preferences for the web" should be English (Google Account > Personal Info > General preferences for the web). As I see, many settings on Google Sites aren't supported in some languages. "
https://support.google.com/sites/thread/269400605?hl=en&msgid=269712380