These are the settings related to Quotes and Invoices. Here you can input the following:
Show Job Contact details on PDFs
Show Additional Notes on PDFs (for Quotes)
Show Additional Notes on PDFs (for Invoices)
# of Days (Invoice is due). Say, 14 entered.
# of Days for Notification (before due). Say, 4 entered.
The two numbers above work in pairs. If set as per the example above (14 & 4), the reminder notification will go out on the 10th day (only if both numbers are set)
Invoice PDF Prefix
ps. This article has been extracted from the Settings All-In-One reference article, which allows you to scroll/scan/browse/search through All settings, if required.