The width of a field can be modified by editing the Field size property in the Field Properties page. By default, appropriate values with respect to the field type are provided for the height and width properties. The height parameter is applicable only for the Multi-line text and Multi-select list fields.
Screen-shot of a drop-down field properties page is given below.
To set height and width for a new field,
To set height and width for an existing field,
To set default values for the height and width parameters,