Microsoft Word has a very useful feature that allows you to split the document view into two separate parts, so you can view and work on, for example, two pages of the same document simultaneously. This functionality has been available in this word processor for a long time.
This is very useful when you need to review document citations in the bibliography section; when you need to review the document’s table of contents and adjust page headings; when you need to use information from one part of the document to fill in another; and so on. There are dozens of situations where this is very useful.
Currently, no word processor in Linux supports this functionality, so I think it would be very well received by the community if OnlyOffice added this feature.