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Unfortunately, there is no such option.
I admit that I personally changed the Sigil code so that it would not inform me about the DOCTYPE problem and I did it with full awareness.
Why? When working on an EPUB file, I always run the "Mend & Prettify Code - all files" function at a certain stage, so any missing DOCTYPEs will be filled automatically.
I came across this message too often, and it turned out to be 99% of the missing DOCTYPE.
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