I've just found the answer to my question.
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The RectilinearLinesUML setting enables you to use rectilinear or oblique
lines when representing a relationship in a diagram. The easiest way to
change this setting is through the GUI.  However, you can change this
setting directly in the rose.ini file.
GUI Settings
On the Edit menu, point to Change Line Styles, and then click either
rectilinear or oblique.  You may also click Toggle to switch between
rectilinear and oblique.

Rose.ini Settings
Type Yes to display rectilinear lines.
Default Setting
The RectilinearLinesUML default setting is No.
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