I’m having the same issue however, I am using the simple theme. Are they instructions similar?
Thank you,
Carol
Topic summary
Adding a quantity selector on Shopify’s Debut theme is built-in: in Customize (Theme Editor), switch the top dropdown to Product Pages, open the Product Pages template, and check “Show quantity selector.” The original poster confirmed this worked; another reply reiterates these steps.
Several users report they can’t find the product page options or that the selector only appears on home page product blocks, suggesting theme updates or differences by template. Others note style inconsistencies in existing buttons.
Inventory/UX issues: the selector allows choosing quantities beyond available stock, with an error only at checkout. Users want the selector capped to in‑stock quantities and clearer messaging.
Alternative solution: a third‑party app (Extendons Quantity Selector) was recommended to add plus/minus buttons, set minimum/maximum limits, quantity increments, and alerts, applicable on product, shop, and cart pages.
Outcomes: The initial request was resolved via the built‑in checkbox. Ongoing concerns include missing selector options in some Debut/Simple setups and enforcing inventory-based limits, which may require custom code or apps.
Attachments: GIFs/screenshots show the Theme Editor location and app UI examples.