You have probably had to flip back and forth between two sections of a document at some point. Whether it was to check the reference list against the inline citations or to confirm that a sentence was repeated several chapters later, you would have quickly realized how difficult it is.
Instead of flipping virtual pages, open up a second view on that document. Sometimes editors make this possible by saving a section (such as references) as a separate document. The most dangerous idea is to create a copy of the file and open that; this always results in editing the wrong copy.
A better solution is to open a second view of the one document. This works in Word, Excel, and other popular software. There are two options for another view: a split screen, or a second window. Below, we’ll look at advantages of each.
One additional advantage of either method is that you can use a different zoom and layout setting for each part. One can be in draft mode and the other in a two-page spread. You can scroll and search in each view independently as well, while the other view remains static.
Look for a “split screen” option in the Window menu (of the software, not the Windows operating system) or on the View tab of a ribbon. The precise location of this option varies between programs.
This split screen gives you two glimpses into a document, within a single window. In the image below, note the scroll bar on each half of the window. Also note that the bottom half is set to a different zoom. You could move this single window anywhere on your screen. Including pairing it with a second window looking at the same document.
This setup is effective for checking cross-references, but the document does tend to jump in one half of the view when you make edits in the other view.
This option is also available on the Window menu (of the program, not the operating system) or View tab of the ribbon. Acrobat Reader has this feature, too. This is a more static way to view two parts of one document. When I edit in window 1, window 2 doesn’t shift.
This also allows to have two different sidebars open on the document at once. In this screen shot you can see that the document map is open in window 1 and a search is open in the other. Normally I do not have the windows overlapping, but arrange then side by side, or on separate monitors. Note that the title bar (the blue border at the top of each window) shows that there are :1 and :2 windows open on this one document.
Multiple windows can be arranged vertically, whereas the split screen only arranges the views horizontally, on top of one another. You can even split the screen in one of the multiple windows, or in all of them. Just how many parts of the document do you need to see at the same time?