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Just set a shortcut to hide and unhide Preview or stack it underneath the Toc dock widget and switch tabs when you need it.
But unless you are trying to edit the book contents all in one huge long file, the delay should not be noticeable..
Trying to edit the book as one long file is a common mistake many people make because they fear it needs to be like that for links and other things to be properly updated. It does not. That is the whole point of Sigil. It handles that just fine. So split that one huge file into its natural chapters (using Sigil split markers or by splitting at cursor tools). This should make updating in Preview almost instantaneous on any modern computer.
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