The horizontal divide between the Inspector and the Preview Pane. Move your mouse over it until the cursor changes. Then hold the left mouse button down while dragging downward until the Inspector is out of sight. You have to have done this at least once before (perhaps the very first installation of Sigil). This has been Sigil's default out-of-the-box Preview behavior since time (or at least Preview) began.
It's exactly like widening/narrowing the Preview widget, or the the Book Browser widget. Except that instead of a vertical divide, it's a horizontal one.
Last edited by DiapDealer; 03-27-2019 at 11:00 PM.
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