The Dimensions pages of the Options dialog is used to edit the default attributes of dimensions.
Unlike most defaults on the Options dialog, changes to dimension defaults can affect dimensions already created on the current model, if they were created using the default settings. This allows a drawing to be quickly changed from one set of defaults to another, as is required when changing from, for example, British (BSI) to American (ANSI) standards. If an attribute of a dimension has been edited using the Dimension toolbar, then any changes in the Options dialog to the default value of that attribute does not affect it.
To edit Dimension defaults: