Canon MG8100 series On-Screen Manual page 99

Duplex printing is not available for full-page borderless printing.
You cannot use A5, B5, and Legal-sized paper, and envelopes for full-page borderless printing.
You can use plain paper for full-page borderless printing only when printing from a computer.
However, this may result in lower print quality. We recommend using plain paper for a trial print.
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