@ phossler
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Did you accidentally click the Green Triangle that points to the right?
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It is not green nor a triangle in my version of Calibre, but I never noticed that dangerous little widget! Easy to click in its position like that. Do you know why anyone would turn off syncing of preview with editor?
Visually, the relative lack of distinction between the on/off positions could also contribute to not even realizing an accidental click happened. It is a button with maybe an up/down position, but no label, like with a checkbox...