If you want to read on multiple devices and have your reading position synchronized then I recommend converting to a Master-MOBI produced using Kindle Previewer or a MOBI-both file created using calibre. That can be emailed to your Amazon account and will be delivered to your devices as KF8 (azw3) format.
In that case the font weight setting will be available, but there will be no page numbers and no page flip and your kindle will not show a cover thumbnail image for the book.
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