We went back and forth as to whether or not this list should be shown as a default saved search. Ultimately it was decided to hide it for now. If you really want it to show up in the list so that you can see which computers have the software installed, use this query to unhide it:
--Get the State column of the Unmanaged Software Saved Search and convert it to XML
DECLARE @State XML
SELECT @State = CAST(State AS XML)
FROM Item
WHERE Guid = '6BF8D972-5F63-45F3-9958-DE9F48E03041' --Unmanaged Software Saved Search
--Now modify the default value of "False" and set it to "True"
SET @State.modify('replace value of (/item/visibleInActivityCenter/text())[1] with "True"')
--Commit the change to the database (this will overwrite the previous State column!)
UPDATE Item
SET State = CAST(@State AS NVARCHAR(MAX))
WHERE Guid = '6BF8D972-5F63-45F3-9958-DE9F48E03041'