Modifying Dimension Styles

By modifing a dimension style, you can update all existing dimensions created previously with that dimension style to reflect the new settings.

Settings in the DDIM Geometry dialog box affect extension lines, dimension lines, arrowheads, center marks or lines, and the offsets between them.
Settings in the DDIM Format dialog box affect the positioning of the parts of the dimension in relation to one another and the orientation of the dimension text.
Settings in the DDIM Annotation dialog box affect the content and appearance of the dimension text.