Onyx Boox Poke5P User Manual page 40

Format
Zoom: You can zoom in/out the
whole page, zoom in the
marquee area, or
pinch-to-zoom any area you
want.
Crop: Tap relevant functions to automatically crop all blank
areas, or blank areas only on the left and right, or the
marquee area.
Margin: This is for the margin you want to keep for
automatic crop. You can adjust it to the size you want.
In zoom-in status, when the zoomed-in page exceeds the
screen area, you can drag the page around to check
different areas. A single tap only turns sub-pages. Tap
the Virtual Buttons to turn the whole page.