-  Click  menu . .
- In the Open Markup DWF dialog box, select afile that contains markups. Click Open. Note:  If you open a digitally signed DWFx file, click Open File in the DWFx - Digital Signature Warning dialog box.  The Markup Set Manager opens and displays the markup set in the tree view.  
- In the Markup Set Manager, click a markup node to view the redline geometry in the drawing area. 
- Click the View Redline Geometry button to hide the redline geometry. 
Click the same button again to show the redline geometry.