I run Rhino on Mac and I have a separate screen in which I want a floating perspective viewport. I read here about how to create a floating viewport, but the command is nowhere to be found. I also went into viewport layout but there I can only pick maximize viewport, no “nefloatingviewport” here either.
You are using the Rhino 5 for Windows help file there.
It doesn’t look like floating viewports are implemented on the Mac platform.
(but that command is not listed here…)