I've got a very simple configurable product - with just one option - size.
But no matter that I have one of the two options marked as default, the front end drop down says Choose an option... and under that in the drop down are the two options.
How do I make the first one (or any) set as the default please?
Editing a configurable product on admin section, we can set the default value for an option by clicking a radio button:
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