The Scrum board does not include the Subtask in the Plan mode - for detailed view of the Subtask, the Work mode can be used. You can also see the Sub-tasks when seeing an issue's details in the Plan mode (the panel on the right side).
You can see the entire discussion regarding this on GHS-6825.
I hope this helps. :)
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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