We combined advanced search and filtering into one interface. Just click on the People tab, and all the advanced search functionality is right there inside the little icon that looks like a funnel.
There will be a notification to point it out when you first sign in to your control panel. You may also notice a few other usability improvements there as well. We hope you like them.
P.S. A few months ago we dramatically improved how targeting works. If you haven’t had a chance to play around with it, check out the HOWTO for more details.