Can't find unparented tasks in backlog on azure board

How can I see all items in azure boards which are actually not done in their right hierarchy. And further more, how can I see unparented tasks in the backlog to plan it for a sprint.

I use epics -> work for months, features -> work for weeks, user stories -> work for days and tasks -> work for hours. So I have unparented tasks and also tasks directly under features for example.

I think you should use iterations for weeks and use iteration backlogs to see the work scope for a week (About area and iteration paths (aka sprints), Define iteration paths (aka sprints) and configure team iterations). In this case all task (with parent features or epics and without parent) will be available on sprint backlog:

Plan task for epics:

Tasks in epic, feature and user story hierarchy:

Taskboard for a sprint:

If your tasks without parent and without sprint you can find it through the query (Create and save managed queries with the query editor):