Change the Band height within the Group Header.
It maybe hard a little to find the Band height. You may want to Add Band for the Group Header first, otherwise that property (resp. set of properties) is simply not there.
Background:
I had a query with “GROUP BY country, current_month“. I let each country Start on a new page. Each current_month had just one element, so I expected them to get displayed in a compact manner, but the default Band height of each group made them display with rather huge gaps.
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