Split at cursor is just a FLAG to Sigil where to break up the file when you press F6 (do the splitting).
Other than that, it will just show as a Horizontal Rule (a line) everywhere.
Margin-bottom (and top) are common causes of a blank page following.
You are not done rendering a block, until everything has been satisfied, so if you have a margin-bottom specified after a full screen image, you get another (blank) screen.
Style (inline) or CSS: Page-Break-Before (or After) will do it
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