After filtering a specific issued invoice, click the icon in the left column of the overview of invoices issued. The detail of the Invoice Issued appears. Using the Print button in the upper part of the invoice detail, generate the PDF file, which you can Open or Save (or you can Cancel the entire action).

If you open (or save and then open) the created file, the issued invoice can be printed in the standard manner (using the File/Print) menu.

In order to open the file, a PDF file browser (e.g. Acrobat Reader) must be installed.