Hi DaveLPG47,
Welcome to Microsoft Community.
Unfortunately, Microsoft Edge for mobile has limited functionality and adjustable configurations and does not include PDF-related configuration items.
Optimization of the product's functionality relies on customer feedback and investigation by the product team.
For product-specific feature suggestions, you can submit your ideas in the feedback option provided by the app.
If I misunderstand your situation, feel free to correct me and share the information.
Best Regards,
Kyo - MSFT | Microsoft Community Technical Support