To calculate the molecular surface of a molecule select the Molecular Surface item in the 3D Structure Viewer context menu or in the Display menu on the toolbar and check one of the following items:

To remove the molecular surface that has already been calculated select the Off item.

You can also select the Molecular Surface Render Style to modify the calculated molecular surface appearance:

     <img src="/wiki/download/attachments/4227386/Calculating Molecular Surface.png"/>