It is difficult to edit some elements within the .svg unless you have some experience of working with .xml files. It is best to open it up in graphic editor like Inkscape and physically move the elements so you can see what you are doing. In order to make the diode 4 holes in length, you need to shorten or shrink the diode and shorten the leads.
Some tutorials are out of date and some are not... Although, the graphic editor itself has a little bit of a learning curve for editing parts.
Try loading this into the breadboard view of your parts editor... I shrunk it down to 4 holes.
http://imgh.us/Small-Diode.svg
Please let me know if you have any problems.