Currently, the Reader List is only accessible when a project is configured as Private or Mixed. If readers were initially added while the project was in Private/Mixed mode and the project is later changed to Public, admins can no longer access the Reader List.
To convert these readers into users, administrators must temporarily change the project back to Private/Mixed, perform the required actions, and then switch it back to Public.
This workflow is cumbersome and impacts usability. Please consider making the Reader List accessible for Public projects as well, allowing administrators to manage existing readers without changing the project's access mode.