Hi @Calum Ridyard,
Unfortunately, this is mostly out of user preferences, and the behavior cannot be changed via code.
If your users are limited within an organization or somewhere you can manage their devices, I suggest you disable a group policy called RestorePdfView, which will forcibly disable the Open PDFs to last viewed location when you reopen files setting for all users.
If you can't manage your users, I suggest you send feedback (Alt+Shift+I) to report this problem to Edge Dev Team. Normally, if you turn on the "restore last viewed location" setting, every #page=<pagenumber>
parameter will be ignored, but in this case only #page=1
is ignored, so it looks like an unexpected behavior to me. So it's better to report this problem to the Team.
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Best Regards,
Shijie Li