(Migrate from ARCHICAD 20 or earlier)
ARCHICAD 21 introduces 3D Styles, a new View Option. (View > 3D View Options > 3D Styles).
In earlier AC versions, these settings were found in 3D Window Settings.
When you migrate an earlier-version project to AC 21, new 3D Styles will automatically be created so that the project’s 3D views look the same as before.
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.