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Go to context mode (View->Context Mode), turn on the view bar (View->Show View Bar), group by due date, remaining actions, and look at the group labeled "no due date". If you want to look at the project that a given action belongs to, you can double-click the row handle (the dot at the left end of the row) and you'll get a new window showing the action in its containing project.

To see the actions without contexts, go to context mode, and click on the line at the top of the sidebar labeled "No Context".