When using "Group by" in List view, each group currently blends together with only a header and whitespace as separation. It would be great to have an optional visual border or card outline around each group, similar to how cards appear in Board view. This would make it much easier to visually distinguish groups at a glance, especially in views with many groups or when presenting to stakeholders. A simple toggle in the view's Group settings (e.g. "Show group borders") would be ideal.