Display sub-tasks in Scrum board

[Kote Khutsishvili]

Is it possible to display sub-tasks in scrum backlog as it is displayed in Kanban backlog?

Screen for sub-tasks in Kanban backlog:

[Tayyab Bashir]

Short Answer: You can't do that. 
This is because you have to manage the backlog on Story level. 
You don't want refine down to sub-task level and micromanage them. 

If you think a sub-task needs that kind of attention that it needs to be prioritized in backlog, then bring it one level up, i.e. convert it to issue level

[Kote Khutsishvili]

I understand. We just needed them for visibility.