Hi @markY6RWE
Machine V2 feature is in Preview, we can enable/disable it from 'Preferences' --> 'Preview Features' --> 'Manufacture'.
Machine V2 Converts machines created under previous versions of Fusion 360 to the latest format. The conversion is necessary to define complex multi-axis machine types using Machine Builder.
More details about, Machine V2 is listed HERE
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Sujay D'souza