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Sort projects in planning mode and actions in context mode by using the sort menu of the view bar. Note that this sort is non-destructive, meaning your data (specifically, the order of your data) has not really been changed, only its appearance has changed. These settings can then be saved as perspectives.

Alternatively, in planning mode, you can select a bunch of items and choose an option from the Edit->Sort menu to destructively sort the selection by a variety of criteria.

Hope this helps.