Hi.
Look into this:
http://www.shoegnome.com/2017/02/26/archicad-elevations-turning-off-color/
For the shadows, use a rule
Criteria:
Element type: 3D element (so it doesn't change other drafting fills, like story level markers)
Override Style:
Fill type: air space or background (override drafting fills)
Fill background pen: 0 (override drafting fills)
But I think there might be a bug in the elevation tool, because looks like you cannot control the shadow in marked distant area.
Best regards.