The slider is OK for kepub books, because then you are just selecting from the number of pages in a chapter. But in a 500+ page epub book there are just not enough gradations on the slider to reliably get closer than about 5-10 pages from the target. Then 20-30 (depending on font size) further taps are needed to get to the correct page. Entering a page number from the keyboard would be much easier, or even having the left/right navigation arrows turn one book page (rather than just one screen page) at a time would make it easier.
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