The description of the highlighted checkbox is incorrect. It should read: "Use original table name as prefix"
I have reported this issue internally: CRI 157735169. Will update here once I get any information.
Best Regards,Qiuyun Yu
I got information that "The name used as a prefix is the name of the column being expanded, not the query/table. This is by design."
That makes more sense, thanks!
There's ambiguity as to which column it refers. It does make sense that it refers to the column being expanded, rather than the column within the expanding table.
Just as the additional information you gave made it more clear, the checkbox would be more clear if it said: "Use name of column being expanded as prefix"