Are you 'Hiding' the white space?

Move the cursor to the top of the page on the screen - just above it, in fact! If you have it in the right place, you'll see an icon that: peresents the bottom part of a page, with an arrow pointing downwards; below this is the top part of a page with an arrow pointing up. Hold it still,and you will get a little popup text saying, either:

Hide White Space
or
Show White Space

If it is Show White Space, then it should already be showing the pages, if not, then choose the Show White Space option.