Sets options for placing dimensions. The Format Dimension command allows you to override the style settings for the current active dimension style. These overrides are applied to new dimensions that are placed using the style. This command does not modify existing dimensions using the style nor does it modify the style dimension for the dimension style.
Once a dimension has been placed with style overrides, subsequent modification of the style (using Format > Style) will not be applied to the existing dimension that was placed with the style overrides.