The following task-related options are available under Edit ▸ Preferences ▸ Calendar and Tasks ▸ Tasks.
Tasks due today:
Select the color for tasks due today.
Overdue tasks:
Select the color for overdue tasks.
Hide completed tasks after:
Select this option to have completed tasks hidden after a period of time measured in days, hours, or minutes. If you do not select this option, completed tasks remain in your task list, marked as complete.
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