To Set the Overall Dimension Scale
Click
Home tab
Annotation panel
Dimension Style
.
Find
In the Dimension Style Manager, select the style you want to change. Click Modify.
In Modify Dimension Style dialog box, Fit tab, under Scale for Dimension Features, enter a value for the overall scale.
Click OK.
Click Close to exit the Dimension Style Manager.
Related Concepts
About Setting the Scale for Dimensions
Related Reference
Commands for Dimension Scales