(Migrate from ARCHICAD versions 10-13)
There is no Automatic Home Story setting in ARCHICAD 21. Elements from older projects (older than AC13) whose Home Story was set to Automatic will now be assigned Home Stories that correspond to the story they were placed on.
In ARCHICAD 21, during editing operations that affect the elements’ elevation (e.g. elevate, multiply with vertical displacement), you have the option to automatically re-assign those elements’ home stories accordingly.