If you want the grouping to start a new page, click within the Footer for the group, Go to the Report Design tab, use the Insert Page Break.
It will show up like this
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Then move it to the bottom of the footer so you include everything.
Hope that helps.
J.
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Please keep in mind as you view my answers I am still a very much a newbie to Access.
Corrections to my post are expected where needed and will be accepted with my humble thankfulness.