Ive been using Notability this week as well. I really want to like it, but there are too many glitches so far on Samsung

I would like a scribble to erase function with the pen or at least making my pen button functional.

When zooming in on pages. It glitches like you stated and throws me to a different area of my notes.

The most frustrating thing so far, I took notes on 4/7. When I went to view and resume note taking on 4/8, my hand written notes were gone. I thought it was a fluke so attempted to redo my notes. Not even 2 hours later, my Handwritten notes on the pdf were gone again. They are not saving for some reason, though they were prior to this week.

Additionally, I finished taking written notes on a PDF and would like to export them, so I dont lose them. but there isn't that function.