Organizing the Group
The remaining two checkboxes effect how the group data is displayed on the report. The first checkbox controls whether the report should try to keep the entire group on the same page. The second checkbox controls whether the group header should be repeated on each page.
Setting the Keep Group Together checkbox is important if you want to prevent having only a few records of a group appearing at the bottom of a page. When this option is on, the entire group is analyzed before it is printed. If it can’t fit on the rest of the page, then the remainder of the page is left blank and the group is started at the top of the next page.
The second checkbox, Repeat Group Header on Each Page, forces the group header to print at the top of every page. This is important for groups that can span multiple pages. By default, if a group extends to a second page then its header is not printed at the top of the second page. It might not be obvious how the detail records are related to each other. If you feel that showing the group header at the top of the page makes your report easier to read, then you should click this checkbox.