Originally Posted by Mrs_Often
Turning page while zoomed in is possible.
When zoomed in, drag the pdf to the left (so you get nearer the right margin of the text). If you drag it slightly further than the edge of the page, you'll get a vertical black bar in the right margin. Tap that. That turns the page.
(The opposite dragging gives you a bar to page back.)
Just try enjoying a book doing that each time