Hi everyone,

Thank you for raising and voting on this suggestion. Your feedback is invaluable in shaping and enhancing Jira for all users. Given the high volume of feature suggestions for Jira, we must prioritize those that provide the most value to the majority of our users. After a thorough review by the team, we have decided that we will not be able to implement this suggestion in the immediate future.
Instead, there are a possible workaround that can be used via a marketplace app: Epic Subtask Issue Viewer

Please remember that jira.atlassian.com is only one of many inputs for our roadmap. We’re continuously learning, analysing and interviewing customers to make Jira better. We encourage you to also share your feedback through Atlassian Community. Please also check out latest updates and upcoming plans from the Jira Cloud roadmap and the Atlassian Cloud release notes blog.

We understand that our decision may be disappointing. Please don't hesitate to contact me if you have any questions or feedback.

Ahmud
Product Manager-Issue View 
aauleear@atlassian.com