By default, it looks like hexl-mode shows 16-bytes per row as the column numbers range from 0x0 - 0xf.

Is there a way to adjust how many byte are displayed per row? E.g. 8-byes per row.

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I don't see such an option in hexl.el, no.

You can do that in nhexl-mode, OTOH: just set the nhexl-line-width variable accordingly (or set it to t which lets it adjust to your window width).

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