If you move a group on the Grouping panel, thereby changing the grouping order, only the moved group changes its orientation. That is, if you move a horizontally rendered group, that group can become vertically rendered, if necessary, but the orientation of no other groups change. If you move a vertically rendered group, that group can become horizontally rendered, if necessary, but no other orientation changes.
Note: All groups to the right of a horizontally rendered group must be horizontal; a document cannot contain a horizontally rendered group followed by a vertically rendered group.
If you move a horizontally rendered group, its orientation depends on the orientation of the groups to its right. The following rules determine whether it remains horizontal or changes to vertical:
If you move a horizontally rendered group to the left
And all groups to the right are horizontal, then the moved group remains horizontal.
And at least one group to the right is vertical, then the moved group is displayed vertically.
If you move a horizontally rendered group to the right
All groups to the right must be horizontal by definition, so the moved group remains horizontal.
If you move a vertically rendered group, its orientation depends on the orientation of the groups to its left. The following rules determine whether it remains vertical or changes to horizontal:
If you move a vertically rendered group to the right
And all groups to the left are vertical, then the moved group remains vertical.
And at least one group to the left is horizontal, then the moved group is displayed horizontally.
If you move a vertically rendered group to the left
All groups to the left must be vertical by definition, so the moved group is displayed horizontally.
An in-depth example is included in the Report Services Document Creation Guide.
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