Clean Up Your Lists
If you mark tasks as completed instead of deleting them, periodically archive or delete old tasks to keep your lists trim.
To mark a task as completed in ToDoList, check the completion box at the end of the row or press Ctrl+Shift+Space. This removes it from your lists. You can also delete the task if you don’t want to keep it around.
CAUTION! Project – Next Step tasks are special. Re-process them when you see them, do NOT mark it as completed until you have re-processed it or the entire project is done!