Migrate from Archicad 20 and earlier
The appearance of 3D views depends on 3D Styles, a View Option. (View > 3D View Options > 3D Styles).
These settings replace the 3D Window Settings of earlier versions.
If your project contains a large number of 3D views with varying settings, be aware that a large number of 3D Styles may be generated, each with a unique name.