Hello friends.  I had some time this afternoon and wrote a tool that should do this quite handily.  It opens a dialog window allowing you to select a Viewport and to set the class and layer visibilities in one window.  It will work from almost anywhere, even from inside the Viewport's annotation or crop space and you should see the results as soon as you click OK.  It will automatically select a VP for you based on whether you're inside an annotation/crop space, whether you have a VP selected, o
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