You can configure manual PDF export permissions, allowing PDF export to users without Teachme Biz account or to Teachme Biz users (members, guests) only.
*Only a group or folder administrator/sub-administrator can set PDF export permissions.
Please refer to the following manual on how to configure permissions.
▼ Enable or disable PDF export (Web Browser)
Related: Can I export a manual as a PDF file or print it out? – Help Center | Teachme Biz