There is no option to turn off auto refresh because I (and others) have never seen a need for it using any image resolutions that can actually be displayed by common epub reading devices. Wrapping an image in svg to scale it is often used over super high resolutions.
Would you please make a copy of your epub (simplified to one or two pages) that I can use to reproduce what you are seeing and figure out why.
If not directly fixable in other ways, I would consider adding that option to the next version of Sigil.
Thanks,
Kevin
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