We have a dedicated instance, Jira Software 8.20.10, and noticed by accident that we were not able any more to configure the Kanban backlog. That is, the option to have as a left column shown all the time "Kanban backlog" is not shown any more. I tried different things (creating a new project, a new kanban from a project and / or filter, ...) but I cannot see the Kanban backlog column any more, and no Backlog item in the left navigation shows up.
Has anyone any idea what is going wrong here? I am Jira administrator on that instance, and tried to find additional information about that issue, but failed.