2.1.1661 Part 1 Section 22.1.2.30, dispDef (Use Display Math Defaults)
a. The standard does not specify any effect of the dispDef element.
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If dispDef is off, Word ignores the following math elements: defJc, lMargin, rMargin, wrapRight, and wrapIndent. When these elements are ignored, Word will use the properties that are specified by the paragraph settings.