To achieve the behavior you want in Acrobat Reader on your Samsung Galaxy Tab A with S Pen—where you can scroll and zoom with your finger while drawing only with the stylus—there isn't a built-in feature like this in Acrobat Reader at the moment. However, there are a few potential solutions or workarounds you could try to enhance your experience:

1. Use "Stylus-only" Mode (if supported)
Some PDF reader apps allow "Stylus-only" input, where only the stylus interacts with the drawing tools, and finger input is reserved for navigation (scrolling/zooming). Unfortunately, Acrobat Reader does not have this feature natively, but you could explore these options:

Check Settings for Input Modes: Open Acrobat Reader, go to Settings, and see if there’s an option to limit drawing to the stylus. Sometimes, different versions of apps or devices may offer advanced features that you might not have noticed.
2. Switch to an Alternative PDF Reader with Stylus-only Input
Apps like Xodo and Squid offer more stylus-friendly features, such as finger-scrolling while using the stylus for drawing or annotating. These apps allow you to:

Use your finger for navigation (scroll/zoom).
Stylus for drawing or annotating, without needing to switch between modes.
These apps can open and annotate PDFs just like Acrobat Reader, and might be better suited for note-taking in medical school.
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Please add this feature Adobe!!! It's been so many years and many people ask for this touch drawing rejection while using stylus. How hard can it be to implement this? Days ago, I tried to make a demo of finger drawing rejection, and it is SO SIMPLE! Why are you ignoring users' voice? Are you trying to push us away?

Infact, please improve the annotation tool completely. This will increase the adobe acrobat userbase significantly. And some loyal users would not have to install other apps for this single purpose. Must needed improvement at this time.

I also have to use other apps like "WPS Office lite" or "Samsung Notes" for this feature. Please ignore the finger touch while using S-PEN or STYLUS while annotation tool is ON. This would help in scrolling the pdf using single finger while using annotation tool. This is a must feature today while tablets are used for work/study from home purposes.

I 100% agree. I do nothing as intense as medical school, but I do create sign-in sheets in Acrobat for my job as a security guard and I have people sign in directly onto the PDF document on my PC. Unfortunately, the mobile architecture doesn't have much intuation for this kind of task and it would be very beneficial because having people sign in on my mobile device instead of my laptop would be much easier.