In order to improve the readability on diagrams a capability available on connectors enables to manage the routing style (e.g to have rectilinear or oblique connectors).
Open Preferences, in Sirius/Sirius Diagram/Connections checks the box enable user specific default values. These setting apply to all diagrams and select the line style wanted.
If you want to change the line styling on a specific set of connectors, once all connectors are selected, you can also select it in the diagram menu as showed in the following picture:
Once all connectors are selected, you can remove Bend points by clicking right on the computer mouse:
