[BetterRed]

@dkplayaclub - what do you use to author the chapters, short stories - likely as not you can do things there that will make life easy in any and all EPUB editors.

As theducks recently wrote elsewhere - he has more than one spanner in his toolbox -- me too, and several screwdrivers, hammers, drills, saws... crow bars?!. He uses Sigil and the calibre-editor, as do I. In one instance (spell checker) he prefers the one in the calibre editor whilst I prefer the one in Sigil - a case of horses for courses.

What could be more WYSIWYG that clicking a button, then sliding a Green Bar in the Preview panel to where you want the split. Typically before a chapter of start of a short story. That's how I do splits in the calibre-editor. Is there another way?

BR