Below the vertical scroll bar are an up-arrow and a down-
arrow button, with a dot button between them. The dot
button will allow you to determine how the arrow buttons
work--will they go to the next section or comment or page
or whatever. If you set this to be the next page,
clicking on the down arrow will move you to the top of the
subsequent page. Keep in mind if you do something like a
find, the dot is automatically reformulated to search for
the next or previous find item with the up/down arrows.
In other words, you might have to reset it to search page-
by-page.