It is possible to hinge a panel directly onto another panel. This is called Bi-fold or Hinged Bi-fold.
Fixed panels are not completely fixed, they are actually semi-fixed. These are generally used as a window covering for windows which do not open (glass only with no track) or used as a divider for privacy when no Hinged, Bi-Fold or Sliding is required.
Fixed panel installs are common in spots where opening panels are obstructed, such as behind a sink in a kitchen.
Fixed panels have a maximum height of 2900mm and a maximum width of 900mm.