As far as size goes, there's the zoom function, and there's switching to landscape mode. Either will make the text appear bigger, though of course it won't actually adjust the font.
As far as chapters, unfortunately no.
The best you can do is maybe make a note as to on which pages the new chapters start, and Go To Page (or whatever it's called) for the one you want. Or if K3 has bookmarking function for PDF (I know it's got highlighting), make bookmarks for the chapters and do the View My Notes & Highlights to access them.
Another trick is to use the search function and tell it to look for "Chapter", but that only works if the PDF really is titled with chapters.
Hope this helps.
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