As we've discovered in this discussion (specifically, here) the Export Persona for Designer on Mac has a Select entry in the Menu that is missing on Windows:
I'm not sure whether it needs to be added on Windows, or removed on Mac, but the two versions should be consistent in the menu functions they allow.
I have no way to know how long it has been like this.
(Note: This also applies to Photo 1.7.1.404.)