You can set or change the properties of a column.
To set column properties in a database diagram
The new setting takes effect in the database diagram as soon as you press the TAB key or click outside the cell in the Properties dialog box. The new setting is saved in the database when you save the table or your diagram.
Note If a column property is visible on the database diagram, you can edit that property value directly without opening the property page. For information about controlling which column properties are visible on a diagram, see Changing a Table View in a Database Diagram.
To set column properties in Table Designer
The new setting takes effect in the database diagram as soon as you press the TAB key or click outside the edited grid cell or control. The new setting is saved in the database when you save the table or your diagram.