Apple Numeric Keyboard can't render the at sign “@” on Mac Mini

Question

I just got a new numeric keyboard for my Mac Mini but when I press Shift + 2, I don't get the at sign (@)--instead, it's a double quote. Then, Shift + 4 shows a euro instead of $, Shift + 6 an ampersand (&) instead of a ^, etc. How do I fix this?

Answer 1

I checked "US," then the checkbox beside "Danish" was enabled, then I unchecked it.