To sort your documents in DISCO, in the Sort by dropdown, click one of the sorting options.
Sorting by relevance is the default sort order when any search is run in the search bar. Sorting by relevance sorts results by their degree of responsiveness to a search. It's most commonly applicable to word or phrase searches. In general, relevance sorting is based on an algorithm that creates a score created using the number of hits for any search term, and weighted according to length of the document. For example, a document with five hits is more relevant than a document with a single hit.
DISCO also offers the ability to select a secondary sort option. To apply a secondary sort, click the then by dropdown to select an additional option.