
Logbook
When you're busy, completed to-dos might clutter up your lists — but not in Things. Things will regularly and automatically put these completed items into the Logbook, where they are kept sorted by completion date.
By default, Things will log completed items every day. This means that when you start fresh in the morning, all completed to-dos will be put away nicely. Of course, logging can always be done manually, e.g., by choosing Items > Log Completed Now from the main menu. You also can change the default setting in the General pane of Things' preferences.