Visualise sub cards relationship
In cards lists we can see an icon on a card indicating a card has children but we cannot see when a card has a parent and we cannot see which card is a child of which card.
Adding an icon for cards with parent would be nice.
And simple highlight on a mouse rollover on all the cards with the same parent child relationship would be even better.
Although in the Gant chart we can see which card has children and who are the children if we expand it. The children are also part of the chart as single entities and the same rollover function would be also welcome in the gant chart.