How to open all documents in PDF?
When you open a PDF file in LibreOffice, the Draw component is used to do this. However, Draw is not a PDF editor. Draw only makes minor changes to PDF files.
If this is not a suitable answer to your question, please specify what exactly you want to achieve. Thank you.
Do you wish to explain further? My best guess would be
How to convert all documents to PDF?
Could be a solvable question, if “all documents” includes only writer-files, as you tagged “writer”. Would not work for me, as all documents will include databases and a lot of stuff unknown to Office…