You can customize the appearance of elements, connecting elements and labels to make your diagram clearer and easier to read.
Select the item.
In the Configuration panel, click Style.
To format multiple items of the same type — for example, all tasks in the diagram:
Press Shift, then select all the items you want to format.
Depending on the type of element you want to change, you have these formatting options:
Format the color of elements.
Fill: color the inside of an element.
Stroke: color the outline of an element.
Format label text and paragraph styles.
Text: change the font type, font size, color and text style.
Paragraph: align text and position.
Format the appearance of Sequence Flows, Message Flows and Data Associations.
Line: Choose between straight and elbow.
Radius: Change the curve radius.
Color: Color the line.