To center the Featured Image in the PDF document please go to the plugin Settings page, switch to the "Output" tab, find the "Custom CSS" section, mark "Enable to add custom CSS code to documents" checkbox and insert the following code:
padding: 0px 35% 0 35%;
You should customize the numerical values of percentages to achieve the best display option.
In some cases, it will be necessary to prescribe a different image class.
This article related to PDF & Print by BestWebSoft plugin
Additional resources: PDF & Print - User Guide
Still need help? Feel free to contact our friendly support team. Create a private ticket