Product page design you can actually tune
The product page module and the Templates screen. Both sit under Design.

A product page should be tunable from the admin — the buy button, the slider, the cart, the crumbs — without a developer.
Open Design → Modules → Product page. That is the product page module.
Set Show Purchase Now button. Set Image slider infinite loop. Save.
Then open Design → Templates. There you set Add to Cart, Quick View, breadcrumbs, preview images, price range, and mobile columns.
Questions about product page design
Design → Modules → Product page. Templates sit next to it under Design → Templates.
Show Purchase Now button and Image slider infinite loop.
Add to Cart, Quick View, breadcrumbs, preview images, price range, and mobile columns.