Relations and dependencies between entities can be displayed as arrows on Board, Roadmap, List views.
Relations between items in any state (open, in progress, closed) are displayed. If a card has an arrow pointing away from it, it's an outbound relation. If a card is being pointed at, it has an inbound relation to the other card.
Show and hide Relations on views
To make Relations visible, press Actions > Relations > Show button:
When Relations are visible, you can select with checkboxes types of Relations you'd like to see. Or, Hide all the Relations completely.
Add, Edit, Delete Relations on views
it's possible to create a relation between two cards directly in a Board view. Simply right-click on the first card, choose "Add relation..." action. Then select the second card and type of relation to be created between them. As soon as the relation is created, an arrow between cards appears.
Relation can be also edited and removed directly from the views. Right-click on an arrow and swap its direction or delete it completely.
On an externally shared view, arrows for Relations will be visible when they are visible on an origin view.
Updates from outdated versions
The built-in feature Show Relations replaces the deprecated extension (mashup) named Custom Unit Show Relations. The mashup should be deactivated in system settings.