Vertical spreading

By default, any excess vertical space is allocated above or below the data content on the page on which the page break occurs. Set the vertical alignment mode to Spread if you need to position the data content at the top of the page data area, with the excess vertical space distributed between the lines, paragraphs and segments of the page data content, provided that the total excess space does not exceed the limit set by the <page-properties> command.

Use the Consolidate space above and Consolidate space below options to identify priority spacing points within your content in the column at which vertical space should be distributed.