This feature request is a duplicate of JRACLOUD-70206. I will link this ticket to the ticket JRACLOUD-70206 and close this ticket.
As an alternative way to view the subtasks and selected subtasks fields in a broader project view, we recommend utilising
the Issue Navigator, which offers a more feature-rich and performant experience for viewing issues and subtasks. By filtering your search by sub-tasks and selecting the fields you want to organize and display, you can gain better visibility into important details like due dates and other relevant information. While this workaround doesn't fully resolve the original issue, we believe it offers an alternative in the interim.
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Product Manager-Issue View
Currently, in JIRA Cloud it isn't possible to change what appears in the Child issues panel in an Epic, formerly known as Issues in Epic.
The columns shown are the issue reference, issue summary, issue type and status.
I would like to be able to customize this and see other information on this screen, such as time tracking information (estimated & remaining) and other fields that can be filtered.