The Sort tab of the Options dialog is used to specify how the items in the list are sorted.

Creation Date / Time

Use this to sort the main list by the created date / time of the recordings.

Name

Use this to sort the main list by the name of the recordings.

Duration

Use this to sort the main list by the duration of the recordings.

Sort In Reverse Order

Use this to sort the main list in reverse order of whatever is selected in the 'Sort By' option.