You can apply a global scale factor to non-ISO linetypes and fill patterns in plot styles. 
-  Click 

  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.