Users can find the PDF & Print Setting option in the Settings.
From there, users can Preview, Upload background, and send Invoices, estimates, Proforma invoices, and all such documents for Thermal Print.
Additionally, users can adjust the Style, Columns, Company, Contact, Notes and Terms, and many more such features.

This is basically divided into three major sections
1. Selection of the Document to be edited.
2. Previewing and selection of background.
3. Basic changes in Style, Header, Company, Notes, and Column.

Users can select Invoice, Estimate, or any of the documents from the drop-down arrow located at the top right corner, as highlighted in the screenshot. 

At the bottom of the document, users have options to reload, preview, and can upload the background of their choices. 

Under the subcategories there is an option to change:

Style
Users can change the Text color, Border color, Fill color, Fill text color. Font size, Paper size can be changed from this option. Horizontal and Vertical lines can be edited either it can be kept hidden or can be shown as per the requirements. Scaling can be adjusted.

Column
According to the requirement, users can enable or disable the Serial number, Date, SKU, Quantity, Price, Discount, Tax as Inclusive or Exclusive, Line total.

Header
Under this option, users can enable or disable the Header, status WaterMark, Invoice number, P.O. Number, Due Date, Total Outstanding, Total Amount.

Company
This allows users to enable or disable the Company Name, ID, Country, Address, Phone, Mobile, Fax, Email, Website.

Contact
Here users can enable the Tax ID, Registered Number,

Summary
In this option, users can enable options like Total quantity, Subtotal, discount, Inline Discount, Shipping Cost, Shipping Methods, Total, Amount Due, Amount Paid, Tax%.

The Signature can be adjusted to the right of the Invoice or to the left of it.

Footer
This option is for the page number which can be enabled or disabled. Also under the same user can align to the left or to the right of the page.

Payment
Payment details, methods can be enabled or disabled under this option.

-Moon Invoice