Thank you for using the plugin. The plugin does work with repeatable sections, and will only merge what the user inputs. Please provide more information regarding your question, “Is it possible to only show the sections added by the user on the frontend form, so the pdf only shows the added sections?”
Have you created the PDF form? If so, please email the form or screenshots to support AT formidablepro2pdf DOT com with more details about what you need and/or don’t need merged.
We remain at your service.