Check Map All Columns option at bottom right side of software to trigger software AI to default map your CSV contacts columns agaianst vCard fields.
Click Remove if you like to delete your earlier field mapping preferences and starting with a new.
Software prompts you with successfull contacts migration message along with counts on contacts exported when done with export.
By default you can view exported vCard contacts in Mac Address Book (component of Mac Mail) else if you have some mail client installed and configured then vCard contacts opened taking their proprietary. For both just double click vCard contact files to view contact data within them.