I also had a problem with this the other day. I don't usually use this tool and am not too familiar with it. I eventually deleted it and drew a new one with the scheme I wanted. A little frustrating and time wasting too.
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)