[nabsltd]

Originally Posted by grizedale

I use minus margin settings when converting to AZW3 to fill Scribe screen, but when I edit in calibre the left and right sides of text are cropped...

Use the following CSS in your EPUB:

@media amzn-kf8 {
  html {
    margin-left: -5.5%;
    margin-right: -5.5%;
    break-inside: avoid;
  }
}

Edit the EPUB to make it look how you want, then convert to an Amazon format as the final step.