You can choose two different styles for the links in a Business Process (BP), direct linking (diagonal) or indirect linking (orthogonal). The style you choose applies to all links in a model and the style is applied automatically.
The default setting is direct linking, which links modeling elements using the most direct line between two modeling elements and using diagonal lines when connecting elements that are not precisely aligned. Indirect linking uses only horizontal and vertical lines with right angles for elements that are not aligned.