The font file might be in a place on the system that is hidden to Design & Print. On your Mac look in the Library > Fonts file, which can be in your User, Local, Network or System file, depending on where the access is. Here’s the Apple description of that….
![User-added image](https://avery.sugarondemand.com/custom/KBImages/0EM1A0000006TRm.png)
If the font is there and still doesn't appear, it might be an OTF (open type font), which isn't supported. Only TTF (true type fonts) are supported.