MaxamAC,
ArchiCad does remember the libraries that are loaded once the file is saved. If you are loading the same file on the same computer then AC file will look for the libraries in the same place where they were originally loaded from.
If you are opening the file on different computers or after someone else has been working on the file on a different computer with a different location of the libraries you will get a window asking you to find those libraries as it is trying to load them from the last saved location and can't find them there.
Hope this is helpful.
Cheers,
Gerald Hoffman
“The simplification of anything is always sensational” GKC
Archicad 4.55 - 27-6000 USA
2019 MacBook Pro-macOS 15.0 (64GB w/ AMD Radeon Pro 5600M GPU)