What do you mean by shadows in layouts?
Shadows in sections / elevations is easy - it is an option in the section or elevation settings. Did you try the help file (attached screenshot)??
(Also - always specify the version of ArchiCAD that you are using when asking a question.)
Cheers,
Karl
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.6, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB