Problem with Editing Submasters in Blind in Offline Nomad

I'm new to a Gio and have been playing with the Nomad Offline editor to follow along with the online training videos. When attempting to edit Submasters in Blind, after I enter the Sub I want to edit (e.g. Sub 1 enter), any digits I enter for the channels I want to work with, the command line says "Sub" and not "Chan" as I would expect. What am I missing?

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