I once saw in a tutorial video (and I hope it was a Rhino tutorial but cannot remember 100%) that the instructor could with one click + pressing a key (?) invert the visibility of his layers.
What I mean by inverting layer visibility:
Imagine you have several layers on/visible and you want to click on one layer, so this one stays visible while all others become hidden. So, it is like the Isolate command but for layers.
Is there such key combination or did the instructor used a custom command?