The four toggles
| Toggle | What it does |
|---|---|
| Show rule messages on product page | Product-level limits warn through the app embed before the shopper reaches the cart |
| Show cart-rule messages on product page | Cart-level limits, meaning order value and weight, also warn on the product page |
| Disable Add to cart when the minimum is not met | The button greys out below the minimum and re-enables as soon as the quantity is valid |
| Start quantity at product minimum | The quantity input opens at the rule's minimum instead of 1 |
Each one is independent. Turning off the first does not turn off the others.
What they do not do
None of these toggles decide whether an order is actually blocked. Enforcement happens in the Shopify Function at checkout, and it runs whatever this section says. See How limits are enforced at checkout.
The practical effect of turning everything off is a shopper who is not warned on the product page, not a shopper who can suddenly buy 3 units of a 6-unit minimum. They fill a cart and get stopped later, which is a worse experience rather than a looser rule.
Choosing settings
Leave Add to cart disabling on for most stores. It is the earliest and clearest signal a shopper gets, and it costs nothing: the button comes back the instant the quantity is valid.
Use "start quantity at product minimum" on single-variant products. On a product with a large variant set, opening at a minimum can pre-fill a quantity against a variant the shopper had not chosen yet. If you would rather they read the warning and set the number themselves, leave it off.
Turn on cart-rule messages when your value or weight rules are the ones shoppers hit most, so a freight ceiling shows up before the cart page rather than at it.
Common mistakes
- Turning every toggle off to pause a rule. That is not what this section does. To stop a rule enforcing, change its status on the rule itself, described in Rule statuses.
- Expecting product page messages with no app embed. The messages are drawn by the app embed. If it is off, nothing renders regardless of these toggles. See Activate the app embed.
- Assuming the cart drawer follows this section. The cart-rule toggle surfaces value and weight warnings on the product page. What shows inside the drawer is a separate matter.