This is a great tool from Microsoft that allows you to match formatting based on already formatted content.
Let’s say you’ve copied and pasted from one document to the other, but the formatting doesn’t match, or you’ve typed away in a document without considering matching the formatting.
Format painter allows you to select the correctly formatted text or paragraph or section and apply that same formatting to wherever else you want in the document.
Select the section you want to keep the format of, press format painter in the ribbon, the cursor will change to a paintbrush and then select the text you want to change. Essentially painting the format over the top.