A custom solution I can suggest you is to reorganize the layout:
- Add a Table item in the GroupHeaderSection;
- Make the table display the desired Field;
- Set the Table.DataSource via binding like:
This will get the data associated with the container of the Table item (the current group's data). For more details check How to use the ReportItem.DataObject property in expressions.
Property Path: DataSource
Expression: = ReportItem.DataObject
- Select the Table item and its Rotate Layout option in the Context Menu - the item will start growing horizontally.
I hope this helps.
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