Came across the same problem. This might help you:
https://community.atlassian.com/t5/Jira-Software-questions/Next-Gen-Story-and-Epic-Link/qaq-p/910068
@Sam Davyson I have an "Epic" dropdown on my board and backlog that allows me to filter by Epic: https://cl.ly/c6eb37aa7bfa
Try checking your project settings to make sure your Roadmap feature is on: https://cl.ly/64032e7b810a
(settings URL: https://<YOUR JIRA URL>/projects/<YOUR PROJECT KEY>/settings/features)
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@Mike Solomon Thank you for this suggestion, that does work as a workaround. However I was trying to filter by Epic in the issues view i.e. at /issues/. There it seems the Epic filter doesn't work on Next-Gen projects.
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@Sam Davyson oh, I see... then I think I may have duplicated your question here: https://community.atlassian.com/t5/Next-gen-questions/How-to-search-for-all-child-issues-of-an-epic-in-a-next-gen/qaq-p/914237
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We are not currently using Next-Gen, but I did find the above article which could be helpful for you! Sorry I was not more help!
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