Onyx Poke5 BOOX User Manual page 44

V2 Engine supports the original layout of the document, including font,
line spacing, margin, graphic typesetting, indentation, etc. When
being switched to V2 Engine, the document will be closed
automatically. Next time when you open the document again, V2
Engine will be used. If you want to switch to NeoReader, you can
disable V2 Engine and reopen the document.
Loading
Progress
The document needs to be
paginated again after switched
Finished
to V2 engine or font and spacing
adjusted. You can check the
pagination progress in the reading Menu/Progress. After the progress
bar is loaded, it means the pagination is completed. You can drag the
progress bar or jump to another page after the pagination is
completed.