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Table data region in Page report has RepeatBlankRows property that lets you control the behavior of blank rows with the help of options:
None: indicates no filling of extra space with blank rows.
FillPage: fills the empty space within a page with blank rows, to reach the table's FixedHeight. Note that this setting is equivalent to property RepeatToFill property (obsolete) set to 'True'.
FillGroup: blank rows are added so that all tables within the same outer group appear with equal height across pages. This mode provides visual alignment in layouts with multiple tables, even if they are bound to different datasets.