I couldn't find the correct setting, so I uninstalled and reinstalled, then opened Sigil from the start menu (blank default epub) and closed down the preview pane.
I was then able to open by double clicking on an epub file, and by using the 'open' selection from within Sigil. That all worked fine.
In every test case - about 6 including default blank epub, pure text page, and cover page with svg shell - when I tried to enable the preview pane Sigil would freeze up (Not Responding).
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