Typing a word-processed manuscript with the layout formatted to display as the printed book may be visually attractive to the writer, but for editing purposes, it is counter-productive, and effectively a waste of the writer's time.
The editor will want a simple, clean document to work with. They may request a certain style of formatting, for example: A4 page layout, inch margins all round, double-line spacing, a legible font. The editor is not interested in how the manuscript will look as a printed book, and during the editing process, any pre-existing formatting set by the writer is likely to be lost.
After editing has taken place, if the manuscript is to be self-published as a printed book, the text will then be typeset to look like the finished product, and this is generally done with specific typesetting software, not word-processing software.