When you move an entity or add a relationship, the relationship line automatically adjusts so that it bends around other objects on the diagram window. The section of line between each bend in a relationship line is called a segment. A one- or two-segment line is drawn automatically unless the entities or tables sharing the relationship are closely aligned either horizontally or vertically.
Relationship lines on the diagram window position automatically when you add a line and when you move the source or destination of the relationship line. For example, when you move an entity, table, or view that has a relationship line attached to it, the position of the relationship line adjusts automatically to connect to the object in its new location.
You can adjust the following options for line positioning:
If you do not like where a relationship bends, you can change the shape of the relation line by dragging each segment in the relationship line to a shape or position that looks better.
You can use the Relationship Auto Layout option on the relationship shortcut menu or click the Redraw All Relationship Lines button in the Layout tab in the Format Preferences dialog to automatically lay out relationship lines.
You can prohibit manual layout of lines by clearing the Allow manual layout check box in the Format Preferences dialog.
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