Fields created in next gen Jira projects are searchable in "Issue Navigator", however they cannot be found in the "Custom Fields" section of the admin panel.
As an example, a project manager created a custom field called "My Test Field" and then removed it from their project, but that custom field still exists out there with a value stored in it. Is there no way to completely delete a custom field once it has been created in a "next-gen" project?