SMS Background Turns into Blue if the member has already been contacted

In Allocations screen, there is a feature that you can enable to easily identify the the members who were already been contacted by text message. As shown in the screenshot below the background of the SMS cell changes in to blue. 

This feature is in disabled state by default for better performance and quicker loading of shifts in the allocations screen. 

Please follow the steps shown in the second screenshot to Enable.