Make sure to update your Paperscan version to our latest version. Click on Software updates in the General tab of Paperscan.
In the meantime you can scan into a custom size (A4 being 210 x297 cm) or, scan into a larger size and then batch crop all the pages so you may define your own borders.
If this option was there previously then there is no reason unless your scanner is not up to date for A4 not to appear in the list now.
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