There is no way to export your family tree that includes photos. You are probably limited to these options if you want to include photos:
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Print the family tree on larger paper (A2 or A0 for example)
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Print the family tree on more pieces of paper (change the width and/or height). If you do this, you will probably want a paper cutter to trim the bottom and right sides to make it easier to tape the pieces of paper together.