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If I don't like the result of a Preview split, I go to the Edit menu and choose the first item which will be something like "Revert to "Before: Split index_split_001.html"
If I don't know what an icon button does (given I'm a card-carrying iconoclast, that is 90% of the time) I hover the mouse and read the tooltip, calibre's tooltips are considerably better than most applications.
I also recommend spending time viewing the Editor video, it covers many of non-obvious features - like checkpoint/reversion of significant events - such as preview splits. And its one of the few "how to" videos I can bear to watch.
BR
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