Hi, @thorsten.
I believe what you are looking for is the method described in the attached image (below).
To my knowledge, there was a plan for a “Layer Off Everywhere” option, but that seems to be obsolete. For Reference: Rhino 8 WIP Feature: New Layer Visibility Control (Obsolete)
My reply will bump your question back up to the top of the list, so maybe we’ll get more responses. @mary may have a better handle on this.
Here’s the test file I used:
Layer Off Everywhere (All Layouts and New Detail Off).3dm (50.8 KB)