I would like my legend items to fill my legend's columns entirely from top to bottom before moving to a new column, using the entire vertical space allocated. Below you can see the space I've allowed for the legend, yet the legend has added an additional column that is not required if it were to fill columns 1 and 2 entirely.

Currently in legends, the columns always try to balance. Table frames on the other hand have a checkbox to either balance or fill columns. The same behavior could be applied to legends.
Original question and discussion posted here