You can apply a global scale factor to non-ISO linetypes and fill patterns in plot styles. 
-  Click   Find Find
- Double-click the plot style table that you want to modify. 
- In the Plot Style Table Editor, General tab, select Apply Global Scale Factor to Non-ISO Linetypes. This option scales linetypes and fill patterns according to a value that you specify.  
- In the Scale Factor box, enter a scale factor to apply. 
- Click Save & Close.