To display the price and icon to the right of the product, we need to use the Choice Info Button prefab.
UI > Shop Layout > Default > List Box > Content Layout > Custom Input Prefab
Here we can select the Choice Info Button prefab.
You need to do this if you have Choice Button selected as the default button.
This isn't a question, but I'll put it here for those who might be as lost as I am.
And solved.
UI > Quantity Selections > General Settings > Default Quantity Selections
Buy Selection > Quantity Selection
Sell Quantity > Quantity Selection
These two are initially None, so we need to select 0:Shop Quantity.
Then when you buy or sell, you will be able to enter the quantity.
However, this may be a problem that only happens to me.
This isn't a question, but I'll put it here for those who might be as lost as I am.