Columns help display more data on a report because it utilizes all of the space on the page. However, if we have groups in the report, the groups could break across multiple columns and start in the middle of the page. We do have a way to make sure each group starts at the top of the next column.
Group value 1 x y z Group value 2 x y z
Group value 1 Group value 2 x x y y z z
Right-click on the Group Header section and select Section Expert