I zoom in to read some PDF files, but I cannot adjust the screen frame to a right place. Each move of the scroll almost shifts for a whole screen or half a page. Hope the scrolling can be improved soon.

p.s. I need some instruction of the soft-bottoms on the e-ink screen. I have no idea what do those icons stand for. For windows, if you put a mouse on a bottom, a brief introduction will appear, but I can't do this with the stylus.

Thank you!