What OS are you using ArchiCAD on?
It may be that your elevation window is minimized. Look at the bottom left of your ArchiCAD screen and see if there's a minimized window down there. Otherwise the window may just be hiding somewhere else.
Have you tried opening the window by double clicking the view/viewpoint in the Navigator or Organizer?
Also, take a look under your Window menu. If the elevation is listed there, that means it is open - somewhere.
Cheers,
Link.
