Provide a visual indication in the tree view when a card or component is not visible.
This will help to easily identify hidden cards and components and prevent missed formatting or function changes on items currently not visible on the editor screen.
The icon could also be functional allowing us to toggle visibility of a card or component without affecting the visible property value. It should highlight if it conflicts with the current visible property value though.
I've seen an eye icon used in other programs with a simple diagonal line through it to indicate the item is not currently visible.