Hi @Zheng49 I understood it differently, as the amenity itself allows you to choose between "Private" and "Public or shared"? Also, the description in the amenity says it's a desk or table "that's just for working" and a chair.
I think the "alternate workspace" is the one for which you would tick public or shared.
I think if it had to be in a separate room, the system would expect you to create a photo tour folder for that room and it would then automatically pull it through to the listing as a dedicated workroom (the way it does for a bedroom and a bathroom). But instead, it calls it a "workspace" and leaves it up to us to tick the amenity.
My understanding is that it really just needs to be a table or desk that isn't used for something else, does that make sense?