Common Color Control

Hello, I recently downloaded a nice transitions template for After Effects. I am not necessarily “new” to After Effects - I can get around ok, but I have a super frustrating question that I cannot seem to solve. It seems so easy. The template contains about 15 transitions and above them all, is a “Common Color Control”. I can change the color ok, but since the author’s posted sample shows the ability to change color, I would like to change color-to-color in the same composition as well. This may not be the correct forum - if not, I apologize. It seems like such an easy solve! Uggh… here’s the link to the sample I would like to match. Currently, all slides remain the same color when I change the “common color control.”