The Floor Plan display of Skylights placed in ARCHICAD 15 and later is based on a 3D projection, not a symbolic depiction.
Exception: Skylights migrated together with older-version projects to ARCHICAD 15 and later will be displayed, by default, using “symbolic” attributes for their Floor Plan display.
Skylights are displayed using the Floor Plan Display settings (e.g. Show on Story) of the host Roof or Shell.
Pens and line types are set for each Skylight, as for Doors/Windows, in the Floor Plan and Section panel of Skylight Settings.
Model View Options (Options for Construction Elements) include options for Skylights, analogous to those of Doors/Windows.