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Yes, that is controlled by whether a period is in the WordChars setting in the hunspell dictionary .aff file. In other words whether the dictionary was designed to support proper spellings of abbreviations like Dr., Mr., Mrs., etc. ...
The new US Spelling dictionary included by Sigil does support that. The older one did not.
If this is not what you want, just install your own hunspell en_US dictionary inside the Sigil Preferences folder and it will take precedence over the one in Sigil and be remembered and used from then on out.
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