As of the latest firmware, there is no way to lock a pdf at a particular zoom level with user-defined margins. You can, however, lock the zoom level itself without your defined margins. This means that the next page you scroll to will be at that same zoom level but the specific margins you like to read under won't be respected as this next page will favor the top left of the document. It's a huge failure on the part of the kobo developers. You end up needlessly expending battery life to scroll the page. A simple zoom AND margin lock button would have gone a loooong way here.
As a related issue, I highly dislike the zoom increments that are available. The Aura goes up and down in increments of 25%, which is way too much. I typically need ~ 115% to compensate for the typically generous margins you find in PDFs. Although any and every discrete zoom level between 100 and 400% is available by clicking on a point on the slider, it's incredibly difficult to use their touch IR sensors for this purpose. Often, I end up increasing the zoom level when I meant to decrease it and vice-versa. Developers, please give us usable zoom increments or a numerical zoom input!
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