How do I see which contacts are due for a visit?

Below the search field in Contacts, tap a chip to show only contacts in that group: Stale, This month, This week, or Never contacted. Each chip shows how many active contacts it holds, and its color matches the contact's pin on the map. Swipe the chips sideways to see them all. Tap the chip again, or tap All, to show everyone. The same chips sit at the top of the map, where they count only contacts with a location and filter the pins; they tuck away while you move the map, so tap the Contacts title to bring them back. To change their order, touch a chip, pause briefly, then drag it along the row; All stays first. The order is a preference, so it's included in backups and syncs with your other devices when sync is on. Groups are based on your most recent visit, and "Not at homes" count as visits. To change when a contact moves between groups, or the colors, tap the info button at the end of the chips (on the map, the legend button) and then the pencil. A chip adds a filter you can also see and remove in Sort & Filter, and it applies to the list and the map alike. Dismissed contacts aren't counted. Nothing is shared; the groups are worked out on your device.