To change the color of a link to other projects (external predecessors), use text styles.
Select Format > Text Styles.
In the Item to Change list, select External Tasks.
Select the font, size, or color you want for the external task.
If you want to change the color of the bar to match the name of the external task name, use bar styles.
Select the Format tab.
Select Bar > Bar Styles.
Note
- The predecessor bar color determines the color of the link.