when you select Unconnected Profiles, under the Find menu, and press the green ‘total’, in the top row, in the middle of the page, and search for a specific surname, you are no longer able to sort them by birth date. that option is still there for your own unconnected profiles.
as a WikiTree Connector that option was very useful, especially trying to put gedcoms back together that splintered on import to WikiTree. or for PM’s who have entered thousands of profiles with same last name from FindAGrave trying to put them together into a tree or connect them helps when you are able to sort the unconnected by birth date.