1)How do I change format of Text Header
2)how do I highlight a header and chapter under it
Please could you explain all three of your questions in more detail, all you've really given us is out-of-context snippets of question.
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Page headers have standardised css so that the authors do not have to think about formatting. You can use your own css for a space, and they will remain consistent. (Please don't have inconsistent header formatting, it's a stupid idea because it's really bad for readers)
Use the panel or highlight macros for highlighting text.
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