How do I disable the scrollbar in the original PDF viewer on Android?

I have an Android 10 Huawei P20. I have not installed any PDF reader apps. I want to disable the scrollbar on the side when I'm reading PDFs. It's way too easy to accidentally hit and end up hundreds of pages off from where I was at, meanwhile not having nearly enough precision to actually be remotely useful. I've been googling it for awhile, but every resource I find just screenshots stuff that looks nothing like the viewer my phone came with by default. Mine doesn't have any settings options as far as I can tell. It gives me a back button to close the file, following by the title of the file I have open, followed by a search option, a share option, and the three vertical buttons which open into options to send the file, download it (even if I opened it from my download folder), print it or send feedback to Google. I also can't find it in my apps list or any mention of pdfs in the settings options for my phone.