First identify what became larger
Kobo Libra Colour supports both EPUB and PDF, but its font controls do not act the same way on them. Kobo explicitly excludes PDF text from font-size and style changes. Magnifying a PDF enlarges the page view; it does not rearrange a dense diagram, a caption and the text beside it into a new layout.
The next page is not always the next tap
Kobo’s PDF help distinguishes two states. Without zoom, tapping or swiping the sides turns pages. Once zoomed in, its instructions tell you to move the view to the page edge before tapping left or right, or use the navigation bar to turn the page. That is a useful distinction when a readable detail occupies only part of an illustrated page.
To enlarge an area, the same help describes opening the reading menu, choosing Navigation and using its zoom slider, or pinching the page. You can drag to pan. Its PDF rotation control turns the page through 90 degrees; that changes the available viewing width, not the document’s underlying typesetting.
Try a sequence, not just a cover
Before choosing this route for a visual reference book, use a document you are permitted to read and follow a real sequence: locate one caption, inspect its corresponding detail, then advance to the next page. Notice whether you keep their relationship clear while panning. A file that opens is not yet evidence that this repeated movement suits your reading.
If the task is mainly continuous prose, an available reflowable edition may be the simpler choice. If the fixed arrangement is essential, keep the PDF and judge its navigation on that basis. This is a viewing decision; buying a stylus or changing a font setting does not by itself turn the fixed page into a newly laid-out book.
Sources & further reading
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