How do I use filters and pivots in People section?

Filters:

1. Search - You can search via keyword or by the persons name. 
2. Tags - If the contact has been tagged, you can search by the tag. To view all the tags, click the drop down next to Tags. 

Pivots:

1. Select all - Click the checkbox to select all contacts.
2. All - Displays all contacts. 
3. Has message - Only displays contacts that have correspondence items. 
4. Has service request - Shows contacts who have service request activities.
5. Sort by - Sorts each pivot by recent activity, last name, recently added and recently viewed.