When you do Ctrl+G it makes hidden collection not showing in Outliner View layer . Only in Orphan data . I personally find it quite convenient for some service things , temporary grouping, testing etc. if you use such group in geometry node it's not orphan anymore but still hidden in "view layer" and not in "Blender file"…
Matte Painter / Set Extension / Concept art from Environments / Cinematograph 3D Artist / Lighting Artist. ---------------------------------------------------------------------------------------- I'm Danny, an environment artist specializing in Cinematography. I offer 2D and 3D services of matte painting, set extension,…