Page Settings and Product Settings are the same screen. A product shows extra tabs because its content lives in its settings.

Press SETTINGS on any page. A normal page shows GENERAL, WIDGETS, AI and SEO. A product also shows PRODUCT, OPTIONS, INVENTORY and PAGE INFO, and a CLONE button.

• On a page, the words and pictures live in the Visual Page Editor. Settings hold the name, web address, status, tags and SEO.
• On a product, the product layout reads its content from Settings: PRODUCT (Price, Page Icon, Gallery Images), PAGE INFO (Summary, Description, Body, Tabs), OPTIONS and INVENTORY.

That is why changing a product's text in the editor may not change the product page. Edit it in Settings.

If a page has no PRODUCT or OPTIONS tab, it is a Page, not a Product. Products are created as products.