3 Viewport Command doesn't work

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Dear members, when I try to split my screen, using the 3 Viewport command, it appears on the bottom left corner that its an Unknown Command.
What can I do solve this?

Best regards.
Rui Santos.

Hi Rui -

Yes, that command isn’t implemented on the macOS version.
I’ve added this thread to open item RH-36782.
-wim