What does Spacer Column do in SW Footer Columns?

In the current Smithworks theme, Spacer Column creates an empty gap between footer columns. Turn it on for a column, then give that column a width under the Custom XL, Desktop, and Tablet settings. The spacer disappears when the footer stacks, and you can set its width to 0% for a screen size where you no longer want the gap. Use it for intentional breathing room, not as a substitute for setting the visible columns to sensible widths.