A red line indicates where the data will be displayed beside the shape on the map.
After you arrange the data on a shape, you can save it as a data format that you can apply to other shapes. For information about data formats, go to What is a data format?.
When you add data to a shape, the process map displays the data label and its value beside the shape. You can hide only the data labels for a selected shape, or you can hide all shape data on the map.