Hi @Jasperalexander
You can use the Ceiling function.
You can add a grouping to your report by entering "=Ceiling(RowNumber(Nothing)/20" in the grouping expression. Then tick "Between each instance of a group" in Page Breaks of the group properties. Note that you want to delete the expression that is automatically generated in sorting, otherwise it cannot be run. If you don't want to display groups, you can choose to remove only columns.
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Best regards,
Aniya