Can customers set the quantity themselves instead of clicking a tier?

Yes. By default, clicking a tier in the widget updates the quantity, and changing the quantity selects the matching tier. Turn off “Clicking a tier updates the quantity” in Settings, Product page, and a tier click only highlights the tier: customers set the quantity in the theme’s quantity field and the matching tier follows. The setting applies to the whole store.

Steps

1. Open Settings in the app and choose Product page.
2. Find Tier and quantity sync.
3. Clear “Clicking a tier updates the quantity” to let the theme’s quantity field drive the tier. Leave it on for two-way sync.
4. Save, then open a product page, change the quantity and watch the selected tier.