I'm going to highjack / revive this thread so I can add one more image.
There's a conversation going on a LinkedIn ArchiCAD Residential Designers Forum (it's private so it can't easily be linked to) on about turning on/off Minimal Space display via MVO. And linkedIN can't handle images. SO silly.
So here's the image for that conversation and the explanation:
If you are using a new version of ArchiCAD, but an old library your MVO won't show all the options for GDL objects because the Library is controlling what you see.
(I'm using this thread because the other images are pertinent to that conversation as well). Thanks!