...
How to visualize issue hierarchy on the roadmap
On the roadmap, you can setup set up a hierarchy with 3 different levels - Epic, Standard Issue, or Subtask.
...
Go to Apps > Swanly roadmaps > Issue view
Switch to Roadmap view
Click on the Hierarchy button in the navbar
Choose necessary hierarchy level in the dropdown
Click on the left part of the swimlane to expand child issues
Click again to hide child issues
...