The whole idea list, can be sorted according to any of displayed columns : click on the column header to have an ascending or descending sort on this column (additional click).

To retrieve the initial idea order (which is the idea tree order of your document), click on the "##" column header.

You can also group the ideas on the values of a particular attribute : select a column header, and drag & drop it into the box area beneath the column headers. You can nest several group criteria.