Maybe their layers are locked.
Or the elements are locked.
Or they are coming from a Hotlinked Module.
If you select those elements what kind of selection hotspot do they have?
Round, square, greyed?
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27