Chart managers can create task grouping. Chart editors and chart viewers are not granted such permission.
To create task grouping you would have to click the button on the top toolbar.
Once clicked, you’ll be able to select the fields you want the tasks to group by.
For task grouping, you would have to select the fields that don’t have prefix “Hierarchy“. Otherwise you’ll start building Gantt chart hierarchy. For instance, in case you want to group tasks by epic, you should select the field Epic Link not the field Hierarchy: Epic.
All the "Hierarchy" fields must go before regular grouping fields.
The example of correctly configured task grouping without creating chart hierarchy:
The example of correctly configured task grouping with the chart hierarchy:
The example of incorrect Gantt chart hierarchy and task grouping:
