iSlide > Export > Export Font
The interface of "Export Font"
Choose the foler location where the font file will be exported to
Use friendly name
Usually, the font name in PowerPoint preview is not the same as the file name saved in the computer. For easy identification, the exported font is named as the well-known name by default. For example:
After exporting by using the friendly name, the fonts will be automatically generated in PowerPoint font preview.