Hi Billy,
Again thanks for your help. Initially, I deleted all the caches and placed an order into the shopping cart. As I previously mentioned it worked. The circle for selection is gone when there is only one option.
After that I played around – placed more items into the shopping cart so that I will see two options (normal shipping vs free shipping) and made sure I can still select one of them.
However, once I removed those items again (so now the total is below free shipping threshold), I am seeing the that selection circle again, even there is one one option.
I am not sure if this has something to do with me updating the shopping cart back and forth. But I thought I will give you more color since I have seen it worked first until it is not.
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Many thanks for your help Billy.