To Set the Dimension Scale for Model Space Dimensions in Layouts

1. Click Drafting tab > Dimension panel > Dimension Style.
2. In the Dimension Style Manager, select the style you want to change. Click Options Modify.
3. In Modify Dimension Style dialog box, Fit tab, under Scale for Dimension Features, select Scale Dimension to Layout (Paper space).
4. Click OK.
5. Click Close to exit the Dimension Style Manager.