If it's the specifics you need: right click on any html code in Code View and highlight the "Reformat HTML" context menu item, and then select the "Mend and Prettify Code - All HTML Files" submenu entry. Whoops. missed that @DNSB has already included the specifics.
You might also want to close the Preview window while you perform the task. Not because it's required, but because it will keep Preview from constantly trying to re-render everything all the time. Once the code has been Prettified, you can reopen Preview
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