1. Link Order and Visualization
If you have configured your account to make the linked cards visible at the closed card view (see the Note below), you will see all linked cards displayed in default order.
The card in the image below (img.1) has all type of card relations, where links are ordered as follows:
- predecessor (curved arrow)
- parent (arrow points up)
- child (arrow points down)
- relative (right arrow)
- successor (curved arrow)
Img.1
Note: to set up your account and make all links visible -> go to the sidebar to the right of your board interface -> select Configure Card View -> checkmark " Show links" (one per row).
2. The Links Overview panel capabilities
In case you have not applied the links preview settings, you can see all linked cards via the Links Overview panel inside the card.
Open the card and go to the Links Overview menu (the bottom right side of the card), where all links are displayed.
Click on any of the links to instantly open the respective linked card.
Users can manually change the order of the links.
Hover on any of the links and place it in the desired position -> Update the card to save all changes.
The system allows users to create new cards and set the type of relation between the cards directly from the Links Overview panel.
Use the plus icon to open the linking panel and create a new linked card or link existing cards in the system. 
Important: There are several ways to link already existing cards and to create new linked cards in the system. Please, check the dedicated article here.