Older readers had a 230kb size limit per xhtml file and loading smaller pages is much much faster than larger pages. So for the best loading speed splitting into files based on natural boundaries (chapters, etc) is simply good epub design.
So merging them all into a single file is generally *not* a good idea.
If you stll want to merge them, you can do so using by highlighting both files (they must be sequential) in BookBrowser and using Merge by using right-click.
More is explained in our Sigil User Guide. It has a short chapter on splitting and merging.
If you have two files to merge that have different css stylesheets, then making sure the class names from the two stylesheets do not conflict before merging is important.
Last edited by KevinH; 07-28-2022 at 08:02 AM.
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