How do I see all contacts from a Sub Team at once?

1.) On the People tab, tap on the Audience drop down at the top and then tap on your team's Shared Audience.

2.) Tap on the funnel icon.

3.) Under Must Match All of These, tap on Collaboration. 

4.) Tap on Sub Team.

5.) Select the Sub Team.

6.) Tap on the check mark in the upper left to save your changes.