Removing Section Ref. Numbers in Staad

I am currently writing a report on a structure and would like to include images from my Staad Pro model which show section assignments. For this I have selected the section under the properties menu, and have 'Highlight Assigned Geometry' checked so when I select the member it highlights the members. However the model is covered in reference numbers ie. R1, R2 etc on each member. 

How do I turn off these reference numbers so the model just shows the skeleton frame and highlighted sections?

Many Thanks, John