I often use the option "Scrolling follows cursor" to make the pdf preview follow the cursor. If the paragraph that is currently being edited is at the bottom of a page, the preview window shows that paragraph all the way at the bottom of the screen. I would like to have it more in the center so I can see the context around it.
Similarly, if a paragraph is split over two pages, the preview panel only shows the part on the first page. By centering the preview panel, also a part on the second page can be shown.