Why do it: Disabling quantity selection prevents users from changing the number of units of products offered as cross-selling, ensuring that only one unit of the product is added to the cart.
Procedure
1. Access the Checkout configuration you want to modify.
2. Within the editing screen, navigate to the section (or tab) titled Cross-selling.
3. In the Cross-selling section, locate the box containing the settings.
4. Look for the field labeled Quantity selection.
5. Check the box next to the option Disable quantity selection.
6. Complete the Checkout saving process to apply the changes.
