I've used the Constant Contact Live Chat Support and my agent confirmed that, in order to reach a contact with a last name beginning with an "M", I must scroll through all of my contacts to find them. All 2,000+. There simply must be an easier way. In the old version, I was able to search for a last name simply by typing in a "B" and all of my "B" contacts would show. Apparently, this does not seem to be an option anymore.
Thanks for sharing this information, I'm sorry to hear of the frustration. Currently the search box requires at least three characters in order to search your list.