There is some way, in MS Word, to get a squiggly line under any word in a sentence where there are two spaces before it. Somehow, that feature is disabled in on my computer but works on my wife's, who...

There is some way, in MS Word, to get a squiggly line under any word in a sentence where there are two spaces before it. Somehow, that feature is disabled in on my computer but works on my wife's, who "gently" reminds me anytime I share a document with her for which there is more than a single space between two words. How can I reactivate this feature?