Microsoft Word tries to detect inconsistent formatting that appears accidental, such as a list item that is indented slightly more than other items in a list. Word will not mark formatting that seems more distinct, such as 12 point Arial and 14 point Arial, because one might be used for body text and the other for headings.
If the instances of similar formatting are not distinct enough, then the Formatting Consistency Checker may not be able to detect them. To help determine the differences between two text selections, so that you can format them consistently, you can compare their formats by using the Reveal Formatting task pane.
I can't select the Mark formatting inconsistencies check box.
To have Microsoft Word identify inconsistent formatting, format tracking must be turned on.
To turn on format tracking:
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On the Tools menu, click Options, and then click the Edit tab.
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Under Editing options, select the Keep track of formatting check box.
The Mark formatting inconsistencies check box should become available.