When you turn this option on, Word checks for inconsistencies as you type the inconsistencies are marked with blue, wavy underlines. For example, occurrences of Arial, 12 point and Arial, 16 point would not be considered inconsistent, since one might be used for body text and the other for headings. In this case, you can turn off number lists and/or bulleted ones. You can see that there’s a number of different stuff you can disable. Then click AutoCorrect Options and choose the AutoFormat as You Go.

If two occurrences of formatting are markedly different, then Word will not designate them as inconsistent. Add special formatting: To add formatting such as strikethrough or subscript, select some text, and then tap the formatting icon. Go to the Options on the File tab and choose Proofing.

Occurrences of direct formatting that match styles that are applied elsewhere in your document.

Occurrences of similar formatting applied to lists.

Occurrences of similar formatting applied directly to text.

Word checks for the following formatting inconsistencies: Consistent formatting can give your documents a more professional look. Change this to your favorite font and size. For example, if most of your headings in a document are 48 point, but you accidentally formatted some as 47 point, Word can help you format them all as 48 point. Click on the Format button and bring up the settings for Font. Microsoft Word can help you determine whether formatting is applied inconsistently in your document. Show All About checking the consistency of formatting

Microsoft word help formatting