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Fill out the Name (Table Group by Type) and select the Type the Group on option. The dialog will automatically fill the Item Expression with the binded data (row["Type"]):
The table view is added to the Tbale item in the Outline view and the Layout:
Run the report to see how data are now grouped by their issue types:
Formatting the Table Group's Header will help to visualize groups better. Select it on the Layout and set the Background Color to Silver in the Properties Editor:
Now, thhe groups highlight better amiog the rest of the data: