You can customize the Class Diagram Editor with a grid setting that provides horizontal and vertical guidelines to help align the entities in the class diagram.
To select default grid settings, perform the following:
1. Select Options from the Tools Menu.
2. Navigate to the UML Designer folder in the Options dialog box.
3. Expand Display to access the following options:
Snap To Grid – Specifies whether entities in the class diagram are snapped to grid intersection points when resized or moved. By default, this is selected.
Show Grid – Specifies whether the grid is displayed. By default, this is selected.
Horizontal spacing – Sets the distance between horizontal grid lines. By default, the value is 10 pixels.
Vertical spacing – Sets the distance between vertical grid lines. By default, the value is 10 pixels.