Rob, AFAIK you can't. I have struggled with this one too. I believe the problem is that AC just sees the opening as a door type object.
A work around would be to end the walls on both sides of the opening and put in a separate header piece of wall above which you could set to show as overhead only with dashed lines. You will have to flip the reference line of the overhead piece of wall or it will not play nice.
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)
well.....VIOLA! (sp?) I just found out from a good friend in the north east coast....you can.
Here's how.
you have to use a different opening object other than "Simple opening"
it appears theres an opening type which "does" indeed allow you to set wrap around drywall closure sizes....very slick.
...Bobby Hollywood live from... i>u Edgewater, FL! SOFTWARE VERSION: Archicad 22, Archicad 23 Windows7 -OS, MAC Maverick OS