This is impossible in JIRA Agile. If you notice, only standard (parent) issues are displayed in Plan mode while sub-tasks are not. The idea behind is to take into account the original estimate of parent issues only. However, remaining estimate of sub-tasks will be cumulated into parent's remaining estimate, which will be used for time tracking in Work mode, where the sub-tasks are visible. So basically:
You can read more about this here.
Hi Community! I’m Elaine, Confluence Product Manager. You may have read my earlier post about page tree in space navigation sidebar. I'm excited to share another improvement that helps you organize ...
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