Agile board doesn't show subtasks

Has this subtask appropriate version to be shown on agile board?
Is it second-level subtask?

Please attach screenshots.

Project LF10 is a parent of project LF11. LF10 shows on the agile board but LF11 doesn't, you have to go within the LF10 project to view the subtask.

Turn on 3-lines mode to see tasks description. Subtasks should be shown after description.

Also please answer on the questions in my previous comment. Thank you!

Thanks for your quick reply Dmitry - that's answered my question. Fantastic stuff.

First-level subtasks are moved through the columns on their swimlane. But second-level subtasks, e.g. a task's subtasks, have to be always connected to their parent (e.g. task) and placed on the single card.

As for resolving parent task on when all subtasks are resolved, please use customizable workflow (as example look at the JT-18908).