When an order contains only products from a given group, it will show all the available methods for that group.
When there is two or more product groups present in an order you need to assign a preferred method to be used in the calculation for the Blended Rate that will appear, instead of listing all available shipping methods.
Assign a method
- Locate the section Blended Rates for..
- Next to Standard Shipping choose the preferred method from the dropdown.
- Click Save
Finish setting-up rates for all shipping zones in each product group.