Hi Michael,
I’m sorry that OneDrive for Business for Mac can only sync the OneDrive for Business library currently. Other libraries are not supported. I understand this may bring some inconvenience, I believe more and more features will be added to the product. So I suggest you submit feedback to the engineering team regarding this matter. Many features of the current programs and updates were designed and upgraded based on our customers’ great and sensible feedback.
Best Regards,
Elaine