How to Add Product Tabs in Shopify Testament Theme

Testament calls this block Accordion — it lets you split a long product page into labeled sections a shopper clicks between, instead of one long scroll.

Steps

1. In your Shopify admin, go to Online Store > Themes and click Customize on Testament.
2. Open a product page and select the Product information section.
3. Click Add block and choose Accordion.
4. Add one tab per section you want — common choices are Description, Shipping & returns, and Size & fit — and fill in each tab's content.
5. In the section's own settings, check whether Allow multiple accordions open at one time is on or off, depending on the behavior you want.
6. Click Save.

Keep it to 3–4 tabs at most — more than that and shoppers stop reading them as distinct sections and just skip past the row entirely.