Column selection flyout displays attributes in a flat list without object-level grouping in the Hierarchy Task Timeline view. Duplicate field names such as "Actuals" and "Percent Complete" appear because the view pulls attributes from multiple related objects without distinguishing categories. This behavior differs from the Task Grid Hierarchy views, where attributes group correctly under their respective objects.
Clarity Modern UX (all versions)
Fixed in 16.5
Follow these steps to manage the ungrouped columns:
Workaround: Use the Task Grid or Hierarchy Timeline views if object-level grouping is required for attribute selection.